Bump activerecord from 5.1.7 to 5.2.4.5 (#123)
Bumps [activerecord](https://github.com/rails/rails) from 5.1.7 to 5.2.4.5.
- [Release notes](https://github.com/rails/rails/releases)
- [Changelog](https://github.com/rails/rails/blob/v6.1.3/activerecord/CHANGELOG.md)
- [Commits](https://github.com/rails/rails/compare/v5.1.7...v5.2.4.5)
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