Bump google-cloud-core from 1.4.1 to 1.4.2 in /requirements (#15635)
Bump google-cloud-core from 1.4.1 to 1.4.2 in /requirements (#15635)

Bumps [google-cloud-core](https://github.com/googleapis/python-cloud-core) from 1.4.1 to 1.4.2.
- [Release notes](https://github.com/googleapis/python-cloud-core/releases)
- [Changelog](https://github.com/googleapis/python-cloud-core/blob/master/CHANGELOG.md)
- [Commits](https://github.com/googleapis/python-cloud-core/compare/v1.4.1...v1.4.2)

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

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
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