use setup-java for java version

.github/workflows/folia.yml

@@ -25,13 +25,15 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '21'
 
       # Runs a set of commands using the runners shell
       - name: 'Build Folia .jar'
         run: |
-          sudo apt update
-          sudo apt install openjdk-21-jre-headless
           sh build.sh
 
       - uses: actions/upload-artifact@v3