Compile test classes to java 8 to fix enforcer

build-plugins/src/main/groovy/com/cloudogu/scm/JavaModulePlugin.groovy

@@ -49,6 +49,10 @@ class JavaModulePlugin implements Plugin<Project> {
       options.release = 8
     }
 
+    project.compileTestJava {
+      options.release = 8
+    }
+
     project.tasks.withType(Javadoc) {
       failOnError false
     }

settings.gradle

@@ -38,16 +38,18 @@ buildscript {
 }
 apply plugin: 'org.kordamp.gradle.enforcer'
 
+// https://kordamp.org/enforcer-gradle-plugin/
+
 enforce {
+  rule(enforcer.rules.RequireGradleVersion) { r ->
+    r.version = '6.7'
+  }
   rule(enforcer.rules.RequireJavaVersion) { r ->
-    r.version = '11.'
+    r.version = '11'
   }
   rule(enforcer.rules.EnforceBytecodeVersion) { r ->
     r.maxJdkVersion = '1.8'
   }
-  rule(enforcer.rules.RequireGradleVersion) { r ->
-    r.version = '6.7'
-  }
 }
 
 includeBuild 'build-plugins'