build(deps): 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] <[email protected]>

Author: dependabot[bot]

.github/workflows/backport.yml

@@ -17,7 +17,7 @@ jobs:
     if: |
       github.event.pull_request.merged == true && startsWith(github.event.label.name, 'backport-')
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha }}
           token: ${{ steps.app-token.outputs.token }}

.github/workflows/cachix.yml

@@ -21,7 +21,7 @@ jobs:
           - nix
           - maximal
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         name: Checkout
 
       - name: Install Nix

.github/workflows/check.yml

@@ -17,7 +17,7 @@ jobs:
     if: "!contains(github.event.pull_request.title, '[skip ci]')"
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Nix
         uses: DeterminateSystems/nix-installer-action@main
@@ -31,7 +31,7 @@ jobs:
     if: "!contains(github.event.pull_request.title, '[skip ci]')"
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Nix
         uses: DeterminateSystems/nix-installer-action@main
@@ -56,7 +56,7 @@ jobs:
     if: "!contains(github.event.pull_request.title, '[skip ci]')"
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Check for typos
         uses: crate-ci/typos@master
@@ -87,7 +87,7 @@ jobs:
         uses: DeterminateSystems/nix-installer-action@main
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set default git branch (to reduce log spam)
         run: git config --global init.defaultBranch main
@@ -115,7 +115,7 @@ jobs:
         uses: DeterminateSystems/nix-installer-action@main
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Build linkcheck package
         run: nix build .#docs-linkcheck -Lv
@@ -126,7 +126,7 @@ jobs:
     if: "!contains(github.event.pull_request.title, '[skip ci]')"
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 2 # slows down checkout, but we need to compare against the previous commit on push events
 

.github/workflows/cleanup.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: "Delete old branches"
         uses: beatlabs/[email protected]

.github/workflows/docs-preview.yml

@@ -28,7 +28,7 @@ jobs:
         uses: DeterminateSystems/nix-installer-action@main
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set default git branch (to reduce log spam)
         run: git config --global init.defaultBranch main
@@ -127,7 +127,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Delete preview for closed/merged PR
         run: |
@@ -164,7 +164,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Double check preview directory deletion
         run: |

.github/workflows/manual.yml

@@ -28,7 +28,7 @@ jobs:
     outputs:
       should_run: ${{ steps.should_run.outputs.should_run }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: print latest_commit
         run: echo ${{ github.sha }}
 
@@ -43,7 +43,7 @@ jobs:
     if: ${{ needs.check_date.outputs.should_run != 'false' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: DeterminateSystems/nix-installer-action@main
       - run: |
           nix build .#docs -Lv