Update dependency org.apache.maven.plugins:maven-gpg-plugin to v3

Author: renovate[bot]

com.api.json.api4json/pom.xml

@@ -90,7 +90,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-gpg-plugin</artifactId>
-				<version>1.6</version>
+				<version>3.2.7</version>
 				<executions>
 					<execution>
 						<id>sign-artifacts</id>