Bump actions/checkout from 5 to 6 (#305)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/docs.yaml

@@ -27,7 +27,7 @@ jobs:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
     steps:
       - name: Check out github
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 
@@ -85,7 +85,7 @@ jobs:
           make html
 
       - name: Check out github
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           path: docs/_build/bs-docs
           ref: gh-pages

.github/workflows/main.yaml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out github
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 
@@ -49,7 +49,7 @@ jobs:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
     steps:
       - name: Check out github
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 
@@ -116,7 +116,7 @@ jobs:
       fail-fast: false
     steps:
       - name: Check out github
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 
@@ -177,7 +177,7 @@ jobs:
       fail-fast: false
     steps:
       - name: Check out github
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 
@@ -227,7 +227,7 @@ jobs:
       fail-fast: false
     steps:
       - name: Check out github
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 
@@ -292,7 +292,7 @@ jobs:
       fail-fast: false
     steps:
       - name: Check out github
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 

.github/workflows/release.yaml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Check out github
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
 
@@ -102,7 +102,7 @@ jobs:
 
     steps:
       - name: Check out github
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: recursive
           ref: main