Bump the maven-plugins group with 2 updates (#63)

Bumps the maven-plugins group with 2 updates: [org.apache.maven.plugins:maven-enforcer-plugin](https://github.com/apache/maven-enforcer) and [org.apache.maven.plugins:maven-gpg-plugin](https://github.com/apache/maven-gpg-plugin).


Updates `org.apache.maven.plugins:maven-enforcer-plugin` from 3.5.0 to 3.6.1
- [Release notes](https://github.com/apache/maven-enforcer/releases)
- [Commits](apache/maven-enforcer@enforcer-3.5.0...enforcer-3.6.1)

Updates `org.apache.maven.plugins: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-enforcer-plugin
  dependency-version: 3.6.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: maven-plugins
- dependency-name: org.apache.maven.plugins:maven-gpg-plugin
  dependency-version: 3.2.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: maven-plugins
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -174,7 +174,7 @@
       <plugin> <!-- use a new version of maven  -->
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-enforcer-plugin</artifactId>
-        <version>3.5.0</version>
+        <version>3.6.1</version>
         <executions>
           <execution>
             <id>enforce-maven</id>
@@ -259,7 +259,7 @@
           <plugin> <!-- sign jar for maven central-->
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-gpg-plugin</artifactId>
-            <version>3.2.7</version>
+            <version>3.2.8</version>
             <executions>
               <execution>
                 <id>sign-artifacts</id>