Bump maven-plugin-plugin from 3.7.0 to 3.8.1 (#1507)

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

---
updated-dependencies:
- 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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

streampipes-maven-plugin/pom.xml

@@ -41,7 +41,7 @@
         <maven-install-plugin.version>2.5.2</maven-install-plugin.version>
         <maven-invoker-plugin.version>3.4.0</maven-invoker-plugin.version>
         <maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
-        <maven-plugin-plugin.version>3.7.0</maven-plugin-plugin.version>
+        <maven-plugin-plugin.version>3.8.1</maven-plugin-plugin.version>
         <maven-resources-plugin.version>3.3.0</maven-resources-plugin.version>
         <maven-surefire-plugin.version>2.22.1</maven-surefire-plugin.version>
     </properties>