Update dependency org.apache.maven.plugins:maven-compiler-plugin to v3.8.1

Author: renovate-bot

Plugin/pom.xml

@@ -46,7 +46,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
-				<version>3.3</version>
+				<version>3.8.1</version>
 				<configuration>
 					<source>1.7</source>
 					<target>1.7</target>

pom.xml

@@ -73,7 +73,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.3</version>
+                <version>3.8.1</version>
                 <configuration>
                     <source>1.8</source>
                     <target>1.8</target>