Bump user-agents from 2.0 to 2.1 in /requirements (from PR #491)
Bump user-agents from 2.0 to 2.1 in /requirements (from PR #491)

Bumps [user-agents](https://github.com/selwin/python-user-agents) from 2.0 to 2.1.
- [Release notes](https://github.com/selwin/python-user-agents/releases)
- [Commits](https://github.com/selwin/python-user-agents/compare/v2.0...v2.1.0)

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

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