Bump activesupport from 5.2.1 to 5.2.4.3
Bump activesupport from 5.2.1 to 5.2.4.3

Bumps [activesupport](https://github.com/rails/rails) from 5.2.1 to 5.2.4.3.
- [Release notes](https://github.com/rails/rails/releases)
- [Changelog](https://github.com/rails/rails/blob/v6.0.3.1/activesupport/CHANGELOG.md)
- [Commits](https://github.com/rails/rails/compare/v5.2.1...v5.2.4.3)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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