CI: fix integration/API tests for 1.9 RC versions

Configure API/integration tests to run on the Yoda 1.9 container
images for Yoda 1.9.x RC versions.

.github/workflows/api-and-integration-tests.yml

@@ -34,7 +34,7 @@ jobs:
     # For other branches, we use the Docker setup of the development branch.
     - name: Determine Yoda repository branch
       run: |
-        if [ "${{ steps.extract_branch.outputs.branch }}" = "release-1.9" ]; then
+        if [ "${{ steps.extract_branch.outputs.branch }}" = "release-1.9" ] || [[ "${{ steps.extract_branch.outputs.branch }}" == rc-1.9.* ]]; then
           echo "branch=release-1.9" >> $GITHUB_OUTPUT
         else
           echo "branch=development" >> $GITHUB_OUTPUT