[Java] Upgrade to Checkstyle 7.2.

Author: mjpt777

build.gradle

@@ -115,7 +115,7 @@ subprojects {
     [compileJava, compileTestJava]*.options*.encoding = 'UTF-8'
 
     dependencies {
-        checkstyle 'com.puppycrawl.tools:checkstyle:7.1.2'
+        checkstyle 'com.puppycrawl.tools:checkstyle:7.2'
         checkstyle 'com.github.sevntu.checkstyle:sevntu-checks:1.21.0'
 
         testCompile 'org.hamcrest:hamcrest-all:1.3'
@@ -126,7 +126,7 @@ subprojects {
 
     checkstyle {
         configFile = new File(rootDir, 'config/checkstyle.xml')
-        toolVersion = '7.1.2'
+        toolVersion = '7.2'
     }
 
     compileJava {