Update dependency time-machine to v2.13.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
time-machine (changelog)	2.12.0 -> 2.13.0

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Release Notes

adamchainz/time-machine (time-machine)

### [`v2.13.0`](https://togithub.com/adamchainz/time-machine/blob/HEAD/CHANGELOG.rst#2130-2023-09-19) [Compare Source](https://togithub.com/adamchainz/time-machine/compare/2.12.0...2.13.0) - Add support for `datetime.timedelta` to `time_machine.travel()`. Thanks to Nate Dudenhoeffer in `PR #​298 `\__. - Fix documentation about using local time for naive date(time) strings. Thanks to Stefaan Lippens in `PR #​306 `\__. - Add `shift()` method to the `time_machine` pytest fixture. Thanks to Stefaan Lippens in `PR #​312 `\__. - Mock `time.monotonic()` and `time.monotonic_ns()`. They return the values of `time.time()` and `time.time_ns()` respectively, rather than real monotonic clocks. Thanks to Anthony Sottile in `PR #​382 `\__.

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