Update rubocop requirement from ~> 1.55.1 to ~> 1.57.0

Updates the requirements on [rubocop](https://github.com/rubocop/rubocop) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.55.1...v1.57.0)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

influxdb-rails.gemspec

@@ -37,7 +37,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rdoc"
   spec.add_development_dependency "rspec"
   spec.add_development_dependency "rspec-rails"
-  spec.add_development_dependency "rubocop", "~> 1.55.1"
+  spec.add_development_dependency "rubocop", "~> 1.57.0"
   spec.add_development_dependency "rubocop-rake"
   spec.add_development_dependency "rubocop-rspec"
   spec.add_development_dependency "sqlite3"