Workflow upgraded to java 21

Author: junkfactory

.github/workflows/build.yml

@@ -16,7 +16,7 @@ name: Build
 on:
   # Trigger the workflow on pushes to only the 'main' branch (this avoids duplicate checks being run e.g., for dependabot pull requests)
   push:
-    branches: [main]
+    branches: [ main ]
   # Trigger the workflow on any pull request
   pull_request:
 
@@ -53,7 +53,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: zulu
-          java-version: 17
+          java-version: 21
 
       # Setup Gradle
       - name: Setup Gradle
@@ -94,7 +94,7 @@ jobs:
   # Run tests and upload a code coverage report
   test:
     name: Test
-    needs: [build]
+    needs: [ build ]
     runs-on: ubuntu-latest
     steps:
       # Free GitHub Actions Environment Disk Space
@@ -113,7 +113,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: zulu
-          java-version: 17
+          java-version: 21
 
       # Setup Gradle
       - name: Setup Gradle
@@ -136,7 +136,7 @@ jobs:
   # Run plugin structure verification along with IntelliJ Plugin Verifier
   verify:
     name: Verify plugin
-    needs: [build]
+    needs: [ build ]
     runs-on: ubuntu-latest
     steps:
       # Free GitHub Actions Environment Disk Space
@@ -155,7 +155,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: zulu
-          java-version: 17
+          java-version: 21
 
       # Setup Gradle
       - name: Setup Gradle