Update rubocop requirement from = 1.63.5 to = 1.64.0

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](https://github.com/rubocop/rubocop/compare/v1.63.5...v1.64.0)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -54,7 +54,7 @@ GEM
     parser (3.3.1.0)
       ast (~> 2.4.1)
       racc
-    racc (1.7.3)
+    racc (1.8.0)
     rack (3.0.9.1)
     rails-dom-testing (2.2.0)
       activesupport (>= 5.0.0)
@@ -65,10 +65,10 @@ GEM
       nokogiri (~> 1.14)
     rainbow (3.1.1)
     rake (13.2.1)
-    regexp_parser (2.9.1)
+    regexp_parser (2.9.2)
     rexml (3.2.8)
       strscan (>= 3.0.9)
-    rubocop (1.63.5)
+    rubocop (1.64.0)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)
@@ -109,7 +109,7 @@ DEPENDENCIES
   minitest (~> 5.23.0)
   mocha (~> 2.3.0)
   rake (~> 13.2.1)
-  rubocop (= 1.63.5)
+  rubocop (= 1.64.0)
   rubocop-github (~> 0.20.0)
 
 BUNDLED WITH

erblint-github.gemspec

@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "mocha", "~> 2.3.0"
   s.add_development_dependency "rake", "~> 13.2.1"
 
-  s.add_development_dependency "rubocop", "= 1.63.5"
+  s.add_development_dependency "rubocop", "= 1.64.0"
   s.add_development_dependency "rubocop-github", "~> 0.20.0"
   s.metadata["rubygems_mfa_required"] = "true"