The main of reusable WF for pr-build.yml

The `Gradle-setup` GH action now installs Gradle `9.0.0`, where not everything is quite ready.

With change in `main` reusable workflow we would use only a Gradle wrapper present in the project’s branch 

Signed-off-by: Artem Bilan <[email protected]>

Author: artembilan

.github/workflows/pr-build.yml

@@ -8,4 +8,4 @@ on:
 
 jobs:
   build-pull-request:
-    uses: spring-io/spring-github-workflows/.github/workflows/spring-gradle-pull-request-build.yml@v5
+    uses: spring-io/spring-github-workflows/.github/workflows/spring-gradle-pull-request-build.yml@main