upgrade maven-gpg to 3.2.7

Author: stevehu

pom.xml

@@ -84,13 +84,13 @@
     <version.jacoco-maven-plugin>0.8.12</version.jacoco-maven-plugin>
     <version.maven-compiler-plugin>3.13.0</version.maven-compiler-plugin>
     <version.maven-bundle-plugin>5.1.9</version.maven-bundle-plugin>
-    <version.maven-gpg-plugin>1.6</version.maven-gpg-plugin>
     <version.maven-javadoc-plugin>3.6.3</version.maven-javadoc-plugin>
     <version.maven-source-plugin>3.2.1</version.maven-source-plugin> <!-- 3.3.0 and above is not Java 8 compatible -->
     <version.maven-surefire-junit5-tree-reporter>1.3.0</version.maven-surefire-junit5-tree-reporter>
     <version.maven-surefire-plugin>3.5.1</version.maven-surefire-plugin>
     <version.moditect-maven-plugin>1.2.2.Final</version.moditect-maven-plugin>
     <version.nexus-staging-maven>1.7.0</version.nexus-staging-maven>
+    <version.maven-gpg>3.2.7</version.maven-gpg>
   </properties>
 
   <dependencies>
@@ -398,7 +398,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-gpg-plugin</artifactId>
-            <version>${version.maven-gpg-plugin}</version>
+            <version>${version.maven-gpg}</version>
             <executions>
               <execution>
                 <id>sign-artifacts</id>