Bump maven.version from 3.6.3 to 3.8.1

Bumps `maven.version` from 3.6.3 to 3.8.1.

Updates `maven-plugin-api` from 3.6.3 to 3.8.1
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](https://github.com/apache/maven/compare/maven-3.6.3...maven-3.8.1)

Updates `maven-core` from 3.6.3 to 3.8.1
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](https://github.com/apache/maven/compare/maven-3.6.3...maven-3.8.1)

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/buildutils/pom.xml b/buildutils/pom.xml
index 90f74a9..c16dd6c 100644
--- a/buildutils/pom.xml
+++ b/buildutils/pom.xml
@@ -39,7 +39,7 @@
 
     <properties>
         <javaVersion>1.8</javaVersion>
-        <maven.version>3.6.3</maven.version>
+        <maven.version>3.8.1</maven.version>
     </properties>
 
     <dependencyManagement>