Update mavenpublish.yml

Author: javasoze

.github/workflows/mavenpublish.yml

@@ -13,11 +13,12 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up Java 11
-      uses: actions/setup-java@v1
+    - uses: actions/checkout@v4
+    - name: Set up Java 21
+      uses: actions/setup-java@v3
       with:
-        java-version: 11
+        distribution: 'temurin'
+        java-version: '21'
         server-id: github # Value of the distributionManagement/repository/id field of the pom.xml
         settings-path: ${{ github.workspace }} # location for the settings.xml file