Merge pull request #30 from opentripplanner/renovate/major-maven-gpg-plugin.version

Update dependency org.apache.maven.plugins:maven-gpg-plugin to v3

Author: leonardehrenfried

pom.xml

@@ -77,7 +77,7 @@
     <maven-source-plugin.version>3.4.0</maven-source-plugin.version>
     <maven-javadoc-plugin.version>3.12.0</maven-javadoc-plugin.version>
     <maven-release-plugin.version>3.3.1</maven-release-plugin.version>
-    <maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>
+    <maven-gpg-plugin.version>3.2.8</maven-gpg-plugin.version>
     <maven-dependency-plugin.version>3.1.2</maven-dependency-plugin.version>
     <maven-compiler-plugin.version>3.14.1</maven-compiler-plugin.version>