remove java8 builds

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

.github/workflows/assembleFlavors.yml

@@ -10,15 +10,14 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                java_version: [ 8, 11 ]
                 flavor: [ Generic, Gplay ]
         steps:
             -   uses: actions/checkout@v2
-            -   name: set up JDK ${{ matrix.java_version }}
+            -   name: set up JDK 11
                 uses: actions/setup-java@v2
                 with:
                     distribution: "adopt"
-                    java-version: ${{ matrix.java_version }}
+                    java-version: 11
             -   name: Build ${{ matrix.flavor }}
                 run: |
                     echo "org.gradle.jvmargs=-Xmx2g -XX:MaxMetaspaceSize=512m -XX:+HeapDumpOnOutOfMemoryError" >> gradle.properties