[Java] Upgrade to Checkstyle 7.8.1.

Author: mjpt777

build.gradle

@@ -117,7 +117,7 @@ subprojects {
  [compileJava, compileTestJava]*.options*.encoding = 'UTF-8'
 
  dependencies {
- checkstyle 'com.puppycrawl.tools:checkstyle:7.8'
+ checkstyle 'com.puppycrawl.tools:checkstyle:7.8.1'
  checkstyle 'com.github.sevntu.checkstyle:sevntu-checks:1.23.1'
 
  testCompile 'org.hamcrest:hamcrest-all:1.3'
@@ -128,7 +128,7 @@ subprojects {
 
  checkstyle {
  configFile = new File(rootDir, 'config/checkstyle/checkstyle.xml')
- toolVersion = '7.8'
+ toolVersion = '7.8.1'
  }
 
  compileJava {