Fix maven java compiler configs.

Remove the -proc:full configuration from pom.xml. We target Java 21, but
the JDK21 does not support "full" (it is the default value, but it can
not be set on the command line). "full" is only supported on JDK22+.

https://inside.java/2023/10/23/quality-heads-up/

pom.xml

@@ -73,9 +73,6 @@
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>${maven-compiler-plugin.version}</version>
-				<configuration>
-					<proc>full</proc>
-				</configuration>
 			</plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>