Bump maven-gpg-plugin from 1.6 to 3.0.1

Bumps [maven-gpg-plugin](https://github.com/apache/maven-gpg-plugin) from 1.6 to 3.0.1.
- [Release notes](https://github.com/apache/maven-gpg-plugin/releases)
- [Commits](apache/maven-gpg-plugin@maven-gpg-plugin-1.6...maven-gpg-plugin-3.0.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

pom.xml

@@ -36,7 +36,7 @@
         <maven-cobertura-plugin.version>2.7</maven-cobertura-plugin.version>
         <maven-coveralls-plugin.version>4.3.0</maven-coveralls-plugin.version>
         <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
-        <maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>
+        <maven-gpg-plugin.version>3.0.1</maven-gpg-plugin.version>
         <maven-nexus-staging-plugin.version>1.6.8</maven-nexus-staging-plugin.version>
         <maven-enforcer-plugin.version>3.0.0-M3</maven-enforcer-plugin.version>
         <java.version>8</java.version>