move used JDK to more prominent place

Author: infeo

pom.xml

@@ -15,6 +15,7 @@
 
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.release>16</maven.compiler.release>
 
 		<!-- dependencies -->
 		<cryptolib.version>2.0.0-beta7</cryptolib.version>
@@ -126,7 +127,6 @@
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>3.8.1</version>
 				<configuration>
-					<release>16</release>
 					<showWarnings>true</showWarnings>
 					<annotationProcessorPaths>
 						<path>