Bump maven-plugin-api from 3.6.3 to 3.8.3

Bumps [maven-plugin-api](https://github.com/apache/maven) from 3.6.3 to 3.8.3.
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.6.3...maven-3.8.3)

---
updated-dependencies:
- dependency-name: org.apache.maven:maven-plugin-api
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

handlebars-maven-plugin/pom.xml

@@ -38,7 +38,7 @@
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-plugin-api</artifactId>
-      <version>3.6.3</version>
+      <version>3.8.3</version>
     </dependency>
 
     <dependency>