The main for Gradle-based reusable workflows

The `gradle-setup` GHA now installs Gradle `9.0.0` where some of the plugins we use are not compatible yet.
Instead, we have to use `gradlew` to rely on the wrapper we have in the branch

(cherry picked from commit b3138f3)

Author: artembilan

.github/workflows/ci-snapshot.yml

@@ -22,7 +22,7 @@ concurrency:
 
 jobs:
   build-snapshot:
-    uses: spring-io/spring-github-workflows/.github/workflows/spring-artifactory-gradle-snapshot.yml@v5
+    uses: spring-io/spring-github-workflows/.github/workflows/spring-artifactory-gradle-snapshot.yml@main
     with:
       gradleTasks: ${{ github.event_name == 'schedule' && '--rerun-tasks --refresh-dependencies' || inputs.gradleOptions }}
     secrets:

.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

.github/workflows/verify-staged-artifacts.yml

@@ -45,4 +45,4 @@ jobs:
           sed -i "1,/springIntegrationVersion.*/s/springIntegrationVersion.*/springIntegrationVersion='${{ inputs.releaseVersion }}'/" build.gradle  
 
       - name: Verify Spring Integration Samples against staged release
-        run: gradle check --init-script staging-repo-init.gradle
+        run: ./gradlew check --init-script staging-repo-init.gradle