`Do not build on Java 8

Author: lukas-krecan

.github/workflows/ci.yml

@@ -12,11 +12,9 @@ jobs:
   build:
     strategy:
       matrix:
-        java: [ '8', '11', '17' ]
+        java: ['11', '17' ]
         # Kotlin needs access to java.util
         include:
-          - java: '8'
-            maven-opts: ''
           - java: '11'
             maven-opts: ''
           - java: '17'