[Java] Upgrade to Checkstyle 8.3.

Author: mjpt777

build.gradle

@@ -118,7 +118,7 @@ subprojects {
     [compileJava, compileTestJava]*.options*.encoding = 'UTF-8'
 
     dependencies {
-        checkstyle 'com.puppycrawl.tools:checkstyle:8.2'
+        checkstyle 'com.puppycrawl.tools:checkstyle:8.3'
 
         testCompile 'org.hamcrest:hamcrest-all:1.3'
         testCompile 'junit:junit:4.12'
@@ -128,7 +128,7 @@ subprojects {
 
     checkstyle {
         configFile = new File(rootDir, 'config/checkstyle/checkstyle.xml')
-        toolVersion = '8.2'
+        toolVersion = '8.3'
     }
 
     compileJava {