Bump maven-artifact from 2.0 to 2.2.1 (#101)

Bumps maven-artifact from 2.0 to 2.2.1.

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Author: dependabot[bot]

plexus-compiler-test/pom.xml

@@ -30,7 +30,7 @@
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-artifact</artifactId>
-      <version>2.0</version>
+      <version>2.2.1</version>
     </dependency>
     <dependency>
       <groupId>org.apache.maven</groupId>