Switch to Java 11 compiler base

pom.xml

@@ -61,8 +61,8 @@
 		<dependency.locations.enabled>false</dependency.locations.enabled>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-		<maven.compiler.source>1.8</maven.compiler.source>
-		<maven.compiler.target>1.8</maven.compiler.target>
+		<maven.compiler.source>11</maven.compiler.source>
+		<maven.compiler.target>11</maven.compiler.target>
 		<maven.compiler.showWarnings>true</maven.compiler.showWarnings>
 		<maven.compiler.showDeprecation>true</maven.compiler.showDeprecation>
 	</properties>