Update github workflow JDK for skinsrestorer

Author: Dantevg

.github/workflows/build.yml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up Node.js 18.x
+    - name: Set up Node.js
       uses: actions/setup-node@v4
       with:
         node-version: latest
@@ -51,10 +51,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up JDK 8
+    - name: Set up JDK 21
       uses: actions/setup-java@v4
       with:
-        java-version: '8'
+        java-version: '21'
         distribution: 'temurin'
         cache: maven
     - name: Get cached js file