Update gradle.yml

Author: CosmicPaul69

.github/workflows/gradle.yml

@@ -22,11 +22,11 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up JDK 17
-      uses: actions/setup-java@v4
-      with:
-        java-version: '17'
-        distribution: 'temurin'
+- name: Set up JDK 21
+  uses: actions/setup-java@v4
+  with:
+    java-version: '21'
+    distribution: 'temurin'
 
     # Configure Gradle for optimal use in GitHub Actions, including caching of downloaded dependencies.
     # See: https://github.com/gradle/actions/blob/main/setup-gradle/README.md
@@ -55,11 +55,11 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up JDK 17
-      uses: actions/setup-java@v4
-      with:
-        java-version: '17'
-        distribution: 'temurin'
+- name: Set up JDK 21
+  uses: actions/setup-java@v4
+  with:
+    java-version: '21'
+    distribution: 'temurin'
 
     # Generates and submits a dependency graph, enabling Dependabot Alerts for all project dependencies.
     # See: https://github.com/gradle/actions/blob/main/dependency-submission/README.md