build(deps): bump org.apache.maven.plugins:maven-gpg-plugin (#167)

Bumps [org.apache.maven.plugins:maven-gpg-plugin](https://github.com/apache/maven-gpg-plugin) from 3.2.7 to 3.2.8.
- [Release notes](https://github.com/apache/maven-gpg-plugin/releases)
- [Commits](apache/maven-gpg-plugin@maven-gpg-plugin-3.2.7...maven-gpg-plugin-3.2.8)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-gpg-plugin
  dependency-version: 3.2.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

pom.xml

@@ -74,7 +74,7 @@
         <maven-source.version>3.3.1</maven-source.version>
         <maven-javadoc.version>3.11.2</maven-javadoc.version>
         <maven-checkstyle.version>3.6.0</maven-checkstyle.version>
-        <maven-gpg.version>3.2.7</maven-gpg.version>
+        <maven-gpg.version>3.2.8</maven-gpg.version>
         <maven-sonatype-staging.version>1.6.13</maven-sonatype-staging.version>
     </properties>