Update dependency webmock to v3.21.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
webmock (changelog)	'3.21.1' -> '3.21.2'

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Release Notes

bblimke/webmock (webmock)

### [`v3.21.2`](https://togithub.com/bblimke/webmock/blob/HEAD/CHANGELOG.md#3212) [Compare Source](https://togithub.com/bblimke/webmock/compare/v3.21.1...v3.21.2) - Corrected type checking in `WebMock::Response#assert_valid_body!` to accurately recognize `Hash` objects. Additionally, improved the clarity of the error message for unsupported body types, guiding users towards proper usage. Thanks to [Jake Robb](https://togithub.com/jakerobb) for reporting.

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[yegor256]

@rultor please, try to merge, since 3 checks have passed

[rultor]

@rultor please, try to merge, since 3 checks have passed

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor please, try to merge, since 3 checks have passed

@yegor256 Done! FYI, the full log is here (took me 1min)