Bump rubocop from 0.63.1 to 0.64.0 (mastodon#10006)

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.63.1 to 0.64.0.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v0.63.1...v0.64.0)

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

Author: dependabot[bot]

Gemfile

@@ -127,7 +127,7 @@ group :development do
   gem 'letter_opener', '~> 1.7'
   gem 'letter_opener_web', '~> 1.3'
   gem 'memory_profiler'
-  gem 'rubocop', '~> 0.63', require: false
+  gem 'rubocop', '~> 0.64', require: false
   gem 'brakeman', '~> 4.4', require: false
   gem 'bundler-audit', '~> 0.6', require: false
   gem 'scss_lint', '~> 0.57', require: false

Gemfile.lock

@@ -525,7 +525,7 @@ GEM
       rspec-core (~> 3.0, >= 3.0.0)
       sidekiq (>= 2.4.0)
     rspec-support (3.8.0)
-    rubocop (0.63.1)
+    rubocop (0.64.0)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
       parser (>= 2.5, != 2.5.1.1)
@@ -746,7 +746,7 @@ DEPENDENCIES
   rqrcode (~> 0.10)
   rspec-rails (~> 3.8)
   rspec-sidekiq (~> 3.0)
-  rubocop (~> 0.63)
+  rubocop (~> 0.64)
   sanitize (~> 5.0)
   scss_lint (~> 0.57)
   sidekiq (~> 5.2)