ci: Use Github hosted runner for OCI

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Author: ChristophWurst

.github/workflows/phpunit-oci.yml

@@ -34,7 +34,7 @@ concurrency:
 
 jobs:
   phpunit-oci:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     strategy:
       matrix: