[WSP-000] Update pull-request-workflow.yml

This is to replace & test ubuntu latest with version 22.04 due to recent changes from Ubuntu actions/runner-images#10636

.github/workflows/pull-request-workflow.yml

@@ -10,7 +10,7 @@ on:
 jobs:
   build-and-test:
     name: "Build and test project"
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     timeout-minutes: 90
     env:
       HIPPO_MAVEN_PASSWORD: ${{ secrets.HIPPO_MAVEN_PASSWORD }}