CI: Had to update Linux container to Ubuntu 22.04 due to action incompatibilities

Author: drowaudio

.github/workflows/build.yaml

@@ -21,7 +21,7 @@ jobs:
             os: ubuntu-latest
             app: pluginval
             test-binary: ./pluginval
-            container: ubuntu:18.04
+            container: ubuntu:22.04
           - name: macOS
             os: macos-12
             app: pluginval.app