Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/builddoc.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Set up Python

.github/workflows/create-release.yml

@@ -27,7 +27,7 @@ jobs:
       attestations: write  # for actions/attest
       id-token: write  # for actions/attest & PyPI trusted publishing
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - name: Set up Python
@@ -99,7 +99,7 @@ jobs:
     permissions:
       contents: write  # for softprops/action-gh-release to create GitHub release
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - name: Get release version

.github/workflows/lint.yml

@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
 
@@ -42,7 +42,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Set up Python
@@ -63,7 +63,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Set up Python
@@ -84,7 +84,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Set up Python
@@ -105,7 +105,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Set up Python
@@ -128,7 +128,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Node.js
       uses: actions/setup-node@v5
       with:

.github/workflows/main.yml

@@ -49,7 +49,7 @@ jobs:
           docutils: "0.21"
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Mount the test roots as read-only
@@ -96,7 +96,7 @@ jobs:
         - "0.22"
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Set up Python ${{ matrix.python }} (deadsnakes)
@@ -129,7 +129,7 @@ jobs:
         - "3.15"
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Set up Python ${{ matrix.python }} (deadsnakes)
@@ -164,7 +164,7 @@ jobs:
         echo "TMP=D:\\Tmp" >> $env:GITHUB_ENV
         echo "TEMP=D:\\Tmp" >> $env:GITHUB_ENV
 
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Set up Python
@@ -193,7 +193,7 @@ jobs:
     timeout-minutes: 15
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Set up Python
@@ -228,7 +228,7 @@ jobs:
         mkdir /tmp/epubcheck && cd /tmp/epubcheck
         wget --no-verbose https://github.com/w3c/epubcheck/releases/download/v${EPUBCHECK_VERSION}/epubcheck-${EPUBCHECK_VERSION}.zip
         unzip epubcheck-${EPUBCHECK_VERSION}.zip
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Set up Python
@@ -261,7 +261,7 @@ jobs:
     timeout-minutes: 15
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Set up Python
@@ -294,7 +294,7 @@ jobs:
       image: ghcr.io/sphinx-doc/sphinx-ci
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Set up Python
@@ -325,7 +325,7 @@ jobs:
     timeout-minutes: 15
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Set up Python

.github/workflows/nodejs.yml

@@ -33,7 +33,7 @@ jobs:
       node-version: "20"
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Use Node.js ${{ env.node-version }}

.github/workflows/transifex.yml

@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Set up Python
@@ -59,7 +59,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Set up Python