Github action: wrapper validation v4 and checkout v4

Author: OdysseusLives

.github/workflows/nebula.yml

@@ -13,8 +13,8 @@ jobs:
     name: "Gradle Wrapper Validation"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: gradle/wrapper-validation-action@v1
+      - uses: actions/checkout@v4
+      - uses: gradle/actions/wrapper-validation@v4
   buildmultijdk:
     if: (!startsWith(github.ref, 'refs/tags/v'))
     needs: validation