[BUGFIX] checkstyle dependency resolution. gradle/gradle#27035 (comment)

Author: Gonzalo Diaz

algorithm-exercises-java/build.gradle

@@ -42,13 +42,19 @@ tasks.named('test') {
 }
 
 checkstyle {
-    toolVersion = '10.12.6'
+    toolVersion = '10.12.5'
     configFile = file("${rootDir}/config/checkstyle/checkstyle.xml")
     maxErrors	= 0
     maxWarnings	= 0
     showViolations = true
 }
 
+configurations.checkstyle {
+  resolutionStrategy.capabilitiesResolution.withCapability("com.google.collections:google-collections") {
+    select("com.google.guava:guava:0")
+  }
+}
+
 def jacocoExclusions = [
         '**/*App.class',
         '**/CustomLogger.class'