Update github_changelog_generator requirement from ~> 1.16.4 to ~> 1.18

[dependabot]

Updates the requirements on github_changelog_generator to permit the latest version.

Release notes

Sourced from github_changelog_generator's releases.

v1.18.0

Changes since v1.17.0

Fixed bugs:

• Fix critical bugs: race condition, wrong tag lookup, branch memoization, nil sections (#1067) by @​skywinder
• Pull requests missing #971

Closed issues:

• Undefined method map for nil:NilClass in client.branches(user_project).map #1020
• commits_in_branch': undefined method `map' for nil:NilClass (NoMethodError) #1016
• github-changelog-generator 1.15 Error #758
• The link to Full Changelog is wrong #918
• Different results when generating a CHANGELOG.md #891

Other:

• Close issues resolved by #1067: #1016, #1020, #971, #758, #918 by @​skywinder

Full Changelog

This Changelog was automatically generated by github_changelog_generator

Commits

• 5a0cbdb Close issues resolved by #1067
• ce0b882 Bump version to 1.18.0
• 1101aa3 Fix critical bugs: race condition, wrong tag lookup, branch memoization, nil ...
• 834ed2f Ignore local Claude settings
• ecb79b9 Release v1.17.0 (#1066)
• bc06eac Replace require with require_relative for internal files (#1063)
• 76b0e96 Fix SSL certificate errors and update RuboCop config (#1064)
• df6622d Avoid processing a single commit multiple times
• 1a9e29c Remove 'Transfer-Encoding' => 'chunked' from stubbed responses
• d62909e Add support for Ruby 4.0
• Additional commits viewable in compare view

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