Bump org.apache.maven:maven-core in /tools/maven-bundle-plugin (#327)

Bumps [org.apache.maven:maven-core](https://github.com/apache/maven) from 3.3.9 to 3.8.1.
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.3.9...maven-3.8.1)

---
updated-dependencies:
- dependency-name: org.apache.maven:maven-core
  dependency-type: direct:production
...

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tools/maven-bundle-plugin/pom.xml

@@ -194,7 +194,7 @@
   <dependency>
     <groupId>org.apache.maven</groupId>
     <artifactId>maven-core</artifactId>
-    <version>3.3.9</version>
+    <version>3.8.1</version>
     <scope>provided</scope>
   </dependency>
   <dependency>