Bump org.apache.maven.plugins:maven-gpg-plugin from 3.2.7 to 3.2.8 (#166)

Author: dependabot[bot]

pom.xml

@@ -114,7 +114,7 @@
     <exec-maven-plugin.version>3.5.1</exec-maven-plugin.version>
     <license-maven-plugin.version>5.0.0</license-maven-plugin.version>
     <maven-enforcer-plugin.version>3.6.0</maven-enforcer-plugin.version>
-    <maven-gpg-plugin.version>3.2.7</maven-gpg-plugin.version>
+    <maven-gpg-plugin.version>3.2.8</maven-gpg-plugin.version>
     <maven-javadoc-plugin.version>3.11.2</maven-javadoc-plugin.version>
     <maven-source-plugin.version>3.3.1</maven-source-plugin.version>
     <maven-surefire-plugin.version>3.5.3</maven-surefire-plugin.version>