Bump mavenVersion from 3.5.2 to 3.8.1

Bumps `mavenVersion` from 3.5.2 to 3.8.1.

Updates `maven-plugin-api` from 3.5.2 to 3.8.1
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.5.2...maven-3.8.1)

Updates `maven-artifact` from 3.5.2 to 3.8.1
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.5.2...maven-3.8.1)

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

Author: dependabot[bot]

pom.xml

@@ -135,7 +135,7 @@
     <mavenTransferVersion>0.13.1</mavenTransferVersion>
     <mavenReportingApiVersion>3.0</mavenReportingApiVersion>
     <mavenReportingVersion>3.0.0</mavenReportingVersion>
-    <mavenVersion>3.5.2</mavenVersion> <!-- Version 3.5.3+ introduces issues for many users of spotbugs that cannot upgrade maven to latest (revisit this when upgrading spotbugs to 4.3.x as that will have provied extremely long legacy support) -->
+    <mavenVersion>3.8.1</mavenVersion> <!-- Version 3.5.3+ introduces issues for many users of spotbugs that cannot upgrade maven to latest (revisit this when upgrading spotbugs to 4.3.x as that will have provied extremely long legacy support) -->
 
     <plexusContainerVersion>2.1.0</plexusContainerVersion>
     <plexusResourcesVersion>1.1.0</plexusResourcesVersion>