build(deps): bump actions/upload-artifact from 5 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/coverage.yml

@@ -104,7 +104,7 @@ jobs:
 
       - name: Upload baseline coverage
         if: github.ref == 'refs/heads/main' && github.event_name == 'push'
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: coverage-baseline
           path: coverage-baseline/main-coverage.txt
@@ -225,7 +225,7 @@ jobs:
 
       - name: Upload coverage artifacts
         if: github.ref == 'refs/heads/main' && github.event_name == 'push'
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: coverage-reports
           path: site/coverage/html/

.github/workflows/docs.yml

@@ -63,7 +63,7 @@ jobs:
           done
       - name: Upload docs artifact
         if: github.ref == 'refs/heads/main' && github.event_name == 'push'
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: docs-reports
           path: ./target/doc/