chore(deps): 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] <support@github.com>

Author: dependabot[bot]

.github/workflows/documentation.yml

@@ -69,7 +69,7 @@ jobs:
       run: sphinx-build -b html -j auto -d docs/_build/cache -q docs docs/_build/html
 
     - name: Save build doc as artifact
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v5
       with:
         name: documentation
         path: docs/_build/html/*

.github/workflows/packager.yml

@@ -45,7 +45,7 @@ jobs:
       - name: Package the latest version
         run: qgis-plugin-ci package latest --allow-uncommitted-changes
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v5
         with:
           name: ${{ env.PROJECT_FOLDER }}-latest
           path: ${{ env.PROJECT_FOLDER }}.*.zip