Bump maven-plugin-plugin.version from 3.7.1 to 3.8.1

Bumps `maven-plugin-plugin.version` from 3.7.1 to 3.8.1.

Updates `maven-plugin-annotations` from 3.7.1 to 3.8.1
- [Release notes](https://github.com/apache/maven-plugin-tools/releases)
- [Commits](apache/maven-plugin-tools@maven-plugin-tools-3.7.1...maven-plugin-tools-3.8.1)

Updates `maven-plugin-plugin` from 3.7.1 to 3.8.1
- [Release notes](https://github.com/apache/maven-plugin-tools/releases)
- [Commits](apache/maven-plugin-tools@maven-plugin-tools-3.7.1...maven-plugin-tools-3.8.1)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugin-tools:maven-plugin-annotations
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.maven.plugins:maven-plugin-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

tooling/conga-aem-maven-plugin/pom.xml

@@ -42,7 +42,7 @@
     <site.url.module.prefix>tooling/conga-aem-maven-plugin</site.url.module.prefix>
 
     <!-- Versions -->
-    <maven-plugin-plugin.version>3.7.1</maven-plugin-plugin.version>
+    <maven-plugin-plugin.version>3.8.1</maven-plugin-plugin.version>
 
     <!-- Enable recording of coverage during execution of maven-invoker-plugin -->
     <jacoco.propertyName>invoker.mavenOpts</jacoco.propertyName>