chore(deps): update dependency github_changelog_generator to '~> 1.18.0'

Author: renovate[bot]

Gemfile

@@ -9,5 +9,5 @@ group :release do
   gem 'faraday-retry', '~> 2.1', require: false
   # https://www.rubyonmac.dev/certificate-verify-failed-unable-to-get-certificate-crl-openssl-ssl-sslerror
   gem "openssl", "~> 4.0.0", require: false
-  gem 'github_changelog_generator', '~> 1.17.0', require: false
+  gem 'github_changelog_generator', '~> 1.18.0', require: false
 end