Bump actions/checkout from 4 to 5

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/notebooks.yml

@@ -36,7 +36,7 @@ jobs:
       run:
         shell: bash -leo pipefail {0}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: ./.github/actions/setup
       - name: Check for changes
         run: ./extras/scripts/check_change.sh ${{ matrix.notebook }}

.github/workflows/publish.yml

@@ -18,7 +18,7 @@ jobs:
       run:
         shell: bash -leo pipefail {0}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0
       - uses: ./.github/actions/setup
@@ -78,7 +78,7 @@ jobs:
       - name: Install dependencies
         run: gem install html-proofer
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/download-artifact@v5
         with:
           name: ${{ matrix.school }}

.github/workflows/tests.yml

@@ -7,7 +7,7 @@ jobs:
     name: Shellcheck
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Run ShellCheck
         uses: ludeeus/action-shellcheck@master
 
@@ -20,7 +20,7 @@ jobs:
       run:
         shell: bash -leo pipefail {0}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: ./.github/actions/setup
       - name: Run tests
         run: make test