Update dependency org.apache.maven:maven-plugin-api to v3

Author: renovate[bot]

pom.xml

@@ -17,7 +17,7 @@
   <url>https://github.com/cvent/raml-validator</url>
 
   <properties>
-    <maven-plugin-api.version>2.0</maven-plugin-api.version>
+    <maven-plugin-api.version>3.9.16</maven-plugin-api.version>
     <raml-parser-2.version>1.0.14</raml-parser-2.version>
     <raml-yagi.version>1.0.14</raml-yagi.version>
     <junit.version>3.8.1</junit.version>