Maintenance: Update dependency overcommit to v0.64.0

Gemfile

@@ -224,9 +224,7 @@ group :development, :test do
 
   # code QA
   gem 'brakeman', require: false
-  # TODO: switch back to released gem once 0.64.0 has been relased with
-  #   https://github.com/sds/overcommit/issues/823
-  gem 'overcommit', git: 'https://github.com/sds/overcommit', branch: 'main'
+  gem 'overcommit'
   gem 'rubocop'
   gem 'rubocop-capybara'
   gem 'rubocop-factory_bot'

Gemfile.lock

@@ -1,13 +1,3 @@
-GIT
-  remote: https://github.com/sds/overcommit
-  revision: 26e78aa9e5e907ed41ebdac8098483af4d54865c
-  branch: main
-  specs:
-    overcommit (0.63.0)
-      childprocess (>= 0.6.3, < 6)
-      iniparse (~> 1.4)
-      rexml (~> 3.2)
-
 GIT
   remote: https://github.com/tschaefer/ruby-keycloak-admin/
   revision: 79b38d75859e08617879ffc75d5313e41c6974b1
@@ -437,6 +427,10 @@ GEM
     openssl (3.2.0)
     openssl-signature_algorithm (1.3.0)
       openssl (> 2.0)
+    overcommit (0.64.0)
+      childprocess (>= 0.6.3, < 6)
+      iniparse (~> 1.4)
+      rexml (~> 3.2)
     parallel (1.25.1)
     parser (3.3.4.0)
       ast (~> 2.4.1)
@@ -807,7 +801,7 @@ DEPENDENCIES
   omniauth-twitter
   omniauth-weibo-oauth2!
   openssl
-  overcommit!
+  overcommit
   parallel
   pg (~> 1.5, >= 1.5.4)
   pry-byebug