Kotlin: Drop our 2.0.255-SNAPSHOT version

It's now older than 2.0.0-RC1

java/kotlin-extractor/kotlin_plugin_versions.py

@@ -46,7 +46,7 @@ def version_string_to_version(version):
 # Version number used by CI.
 ci_version = '1.9.0'
 
-many_versions = [ '1.5.0', '1.5.10', '1.5.20', '1.5.30', '1.6.0', '1.6.20', '1.7.0', '1.7.20', '1.8.0', '1.9.0-Beta', '1.9.20-Beta', '2.0.0-RC1', '2.0.255-SNAPSHOT' ]
+many_versions = [ '1.5.0', '1.5.10', '1.5.20', '1.5.30', '1.6.0', '1.6.20', '1.7.0', '1.7.20', '1.8.0', '1.9.0-Beta', '1.9.20-Beta', '2.0.0-RC1' ]
 
 many_versions_versions = [version_string_to_version(v) for v in many_versions]
 many_versions_versions_asc  = sorted(many_versions_versions, key = lambda v: v.toTupleWithTag())