fix: update gpg version (#22)

Author: dogun-anduril

pom.xml

@@ -102,7 +102,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-gpg-plugin</artifactId>
-                <version>1.5</version>
+                <version>1.6</version>
                 <executions>
                     <execution>
                         <id>sign-artifacts</id>