build(deps): Bump org.apache.maven.plugins:maven-gpg-plugin

Bumps [org.apache.maven.plugins:maven-gpg-plugin](https://github.com/apache/maven-gpg-plugin) from 3.1.0 to 3.2.1.
- [Release notes](https://github.com/apache/maven-gpg-plugin/releases)
- [Commits](apache/maven-gpg-plugin@maven-gpg-plugin-3.1.0...maven-gpg-plugin-3.2.1)

---
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]>

org.eclipse.transformer.parent/pom.xml

@@ -190,7 +190,7 @@ SPDX-License-Identifier: ${project.licenses[0].name}
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-gpg-plugin</artifactId>
-					<version>3.1.0</version>
+					<version>3.2.1</version>
 					<executions>
 						<execution>
 							<id>sign-artifacts</id>