updating github action for gradle build

Author: GGoetzelmann

.github/workflows/gradle.yml

@@ -7,7 +7,7 @@ on:
   push:
     branches: [ main, development ]
   pull_request:
-    branches: [ main ]
+    branches: [ main, development ]
 
 env:
     # JDK version used for building jar file
@@ -19,12 +19,12 @@ jobs:
       matrix:
         operating-system: [ubuntu-latest, macOS-latest]
         # Use both LTS releases and latest one for tests
-        jdk: [ 17 ]
+        jdk: [ 17, 21 ]
     steps:
     - name: Checkout repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
     - name: Set up OpenJDK version ...
-      uses: actions/setup-java@v2
+      uses: actions/setup-java@v4
       with:
         distribution: 'zulu' 
         java-version: ${{ matrix.jdk }}