Bump org.apache.maven:maven-core in /hadoop-maven-plugins

Bumps [org.apache.maven:maven-core](https://github.com/apache/maven) from 3.0.5 to 3.8.1.
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](https://github.com/apache/maven/compare/maven-3.0.5...maven-3.8.1)

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

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

hadoop-maven-plugins/pom.xml

@@ -26,7 +26,7 @@
   <packaging>maven-plugin</packaging>
   <name>Apache Hadoop Maven Plugins</name>
   <properties>
-    <maven.dependency.version>3.0.5</maven.dependency.version>
+    <maven.dependency.version>3.8.1</maven.dependency.version>
     <maven.plugin-tools.version>3.6.0</maven.plugin-tools.version>
   </properties>
   <dependencies>