Update rubocop requirement to 0.52.1

Updates the requirements on [rubocop](https://github.com/bbatsov/rubocop) to permit the latest version.
- [Release notes](https://github.com/bbatsov/rubocop/releases)
- [Changelog](https://github.com/bbatsov/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bbatsov/rubocop/commits/v0.52.1)

Author: dependabot-support

Gemfile

@@ -3,4 +3,4 @@ source "https://rubygems.org"
 # Specify your gem's dependencies in language_server.gemspec
 gemspec
 
-gem "rubocop", "0.52"
+gem "rubocop", "0.52.1"