Update build.yml

Author: MrButtersDEV

.github/workflows/build.yml

@@ -13,11 +13,11 @@ jobs:
       - name: 📦 Checkout Code
         uses: actions/checkout@v3
 
-      - name: ☕ Set up Java 17
+      - name: ☕ Set up Java 21
         uses: actions/setup-java@v3
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
 
       - name: 🏷 Get current base version from pom.xml
         id: version