Upgrade plexus-compiler-{eclipse|javac|javac-errorprone} to 2.8.6

Change-Id: Ie49e487a2bc10b62db623f2e128fa063bfbc77bf
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

pom.xml

@@ -846,12 +846,12 @@
               <dependency>
                 <groupId>org.codehaus.plexus</groupId>
                 <artifactId>plexus-compiler-javac</artifactId>
-                <version>2.8.5</version>
+                <version>2.8.6</version>
               </dependency>
               <dependency>
                 <groupId>org.codehaus.plexus</groupId>
                 <artifactId>plexus-compiler-javac-errorprone</artifactId>
-                <version>2.8.5</version>
+                <version>2.8.6</version>
               </dependency>
               <!-- override plexus-compiler-javac-errorprone's dependency on
                   Error Prone with the latest version -->
@@ -890,7 +890,7 @@
               <dependency>
                 <groupId>org.codehaus.plexus</groupId>
                 <artifactId>plexus-compiler-eclipse</artifactId>
-                <version>2.8.5</version>
+                <version>2.8.6</version>
               </dependency>
               <dependency>
                 <groupId>org.eclipse.jdt</groupId>