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/pull-requests.yml

@@ -62,7 +62,7 @@ jobs:
           cd android && ./gradlew assembleRelease --no-daemon --build-cache
 
       - name: Upload APK as artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: opendtu-app
           if-no-files-found: error

.github/workflows/release.yml

@@ -84,7 +84,7 @@ jobs:
           rm android/app/build/outputs/apk/release/*-aligned.apk
 
       - name: Upload APK as artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: opendtu-app
           path: |