Bump actions/checkout from 4 to 5 (#792)

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

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: MkDocs
         run: |

.github/workflows/test.yml

@@ -62,7 +62,7 @@ jobs:
           wget https://github.com/rust-analyzer/rust-analyzer/releases/download/$RUST_ANALYZER_VERSION/rust-analyzer-linux -O $HOME/bin/rust-analyzer
           chmod +x $HOME/bin/rust-analyzer
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Run tests
         run: 'make ci'