config: update checkstyle.version to 0.0 to make it clear it is must be updated before use

Author: romani

checkstyle-tester/pom.xml

@@ -12,7 +12,7 @@
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<checkstyle-plugin.version>3.1.1</checkstyle-plugin.version>
-		<checkstyle.version>10.4-SNAPSHOT</checkstyle.version>
+		<checkstyle.version>0.0-SNAPSHOT</checkstyle.version>
 		<sevntu-checkstyle.version>1.42.0</sevntu-checkstyle.version>
 		<checkstyle.config.location>https://raw.githubusercontent.com/checkstyle/checkstyle/master/src/main/resources/google_checks.xml</checkstyle.config.location>
 		<checkstyle.failsOnError>true</checkstyle.failsOnError>