Bump org.apache.maven.plugins:maven-invoker-plugin from 3.7.0 to 3.8.1

Bumps [org.apache.maven.plugins:maven-invoker-plugin](https://github.com/apache/maven-invoker-plugin) from 3.7.0 to 3.8.1.
- [Release notes](https://github.com/apache/maven-invoker-plugin/releases)
- [Commits](apache/maven-invoker-plugin@maven-invoker-plugin-3.7.0...maven-invoker-plugin-3.8.1)

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

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

plexus-compiler-its/pom.xml

@@ -46,7 +46,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-invoker-plugin</artifactId>
-        <version>3.7.0</version>
+        <version>3.8.1</version>
         <executions>
           <execution>
             <id>integration-tests</id>