build(deps): bump maven-gpg-plugin from 3.0.1 to 3.1.0

Bumps [maven-gpg-plugin](https://github.com/apache/maven-gpg-plugin) from 3.0.1 to 3.1.0.
- [Commits](apache/maven-gpg-plugin@maven-gpg-plugin-3.0.1...maven-gpg-plugin-3.1.0)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-gpg-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

exist-parent/pom.xml

@@ -926,7 +926,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-gpg-plugin</artifactId>
-                    <version>3.0.1</version>
+                    <version>3.1.0</version>
                 </plugin>
                 <plugin>
                     <groupId>de.jutzig</groupId>