Bump org.apache.maven.plugins:maven-gpg-plugin from 3.2.7 to 3.2.8

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
...

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

Author: dependabot[bot]

pom.xml

@@ -75,7 +75,7 @@
     <maven-surefire-plugin.version>3.5.3</maven-surefire-plugin.version>
     <maven-dependency-plugin.version>3.8.1</maven-dependency-plugin.version>
     <checksum.maven.plugin.version>1.11</checksum.maven.plugin.version>
-    <maven.gpg.plugin.version>3.2.7</maven.gpg.plugin.version>
+    <maven.gpg.plugin.version>3.2.8</maven.gpg.plugin.version>
     <buildnumber.plugin.version>3.2.1</buildnumber.plugin.version>
     <maven-resources-plugin.version>3.3.1</maven-resources-plugin.version>
     <maven-clean-plugin.version>3.5.0</maven-clean-plugin.version>