fixed workflow for ci process

.github/workflows/ant-build-selfhosted.yaml

@@ -8,10 +8,10 @@ jobs:
     if: github.repository == 'yacy/yacy_search_server'
     steps:
     - uses: actions/checkout@master
-    - name: Set up JDK 8
+    - name: Set up JDK 11
       uses: actions/setup-java@v3
       with:
-        java-version: '8'
+        java-version: '11'
         distribution: 'temurin'
     - name: Build linux release
       run: ant clean all dist