Bump actions/upload-artifact from 4 to 5

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 5.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v5)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/coverage.yml

@@ -66,7 +66,7 @@ jobs:
           COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
           PULL_REQUEST_NUMBER: ${{ github.event.number }}
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v5
         if: always()
         with:
           name: suite_result

.github/workflows/locked.yml

@@ -60,7 +60,7 @@ jobs:
       - name: Test
         run: opam exec -- dune runtest
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v5
         if: always()
         with:
           name: suite_result-${{ matrix.os }}