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] <[email protected]>

Author: dependabot[bot]

.github/workflows/nightly.yml

@@ -71,7 +71,7 @@ jobs:
     # Attach the packaged artifacts to the workflow output. These can be manually
     # downloaded for later inspection if necessary.
     - name: Archive artifacts
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v5
       with:
         name: Release
         path: FirebaseAdmin/FirebaseAdmin/bin/Release

.github/workflows/release.yml

@@ -82,7 +82,7 @@ jobs:
     # Attach the packaged artifacts to the workflow output. These can be manually
     # downloaded for later inspection if necessary.
     - name: Archive artifacts
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v5
       with:
         name: Release
         path: FirebaseAdmin/FirebaseAdmin/bin/Release