Use new PR workflow

Author: ryanjbaxter

.github/workflows/maven.yml

@@ -0,0 +1,12 @@
+name: PR
+
+on:
+  pull_request:
+    branches: [ 4.3.x ]
+
+jobs:
+  build:
+    uses: spring-cloud/spring-cloud-github-actions/.github/workflows/pr.yml@main
+    secrets:
+      ARTIFACTORY_USERNAME: ${{ secrets.ARTIFACTORY_USERNAME }}
+      ARTIFACTORY_PASSWORD: ${{ secrets.ARTIFACTORY_PASSWORD }}