Migrate to Node 20 on CI via GitHub Actions major upgrades (#372)

* Update first party actions to Node 20 majors.

* Update Gradle cache actions to Node 20 majors.

.github/workflows/manually.yml

@@ -39,7 +39,7 @@ jobs:
     
     steps:
     - name: checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: validate gradle wrapper
       uses: gradle/wrapper-validation-action@v1
@@ -51,12 +51,12 @@ jobs:
         npm run lint
         npm test
 
-    - uses: actions/setup-java@v3
+    - uses: actions/setup-java@v4
       with:
         distribution: 'zulu'
         java-version: 21
 
-    - uses: gradle/gradle-build-action@v2
+    - uses: gradle/actions/setup-gradle@v3
       with:
         gradle-home-cache-cleanup: true