[beta-1.79] fix(toml): Don't warn on lints.rust.unexpected_cfgs.check-cfg

[epage]

Beta backports:

• #13913 (sort of): removes just the lint warning (in a different way to be minimal) so we reduce warning noise for people using this key on nightly

In order to make CI pass, the following PRs are also cherry-picked:

• #13865

[rustbot]

r? @weihanglo

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[rustbot]

:warning: Warning :warning:

• Pull requests are usually filed against the master branch for this repo, but this one is against rust-1.79.0. Please double check that you specified the right target!

[epage]

The nightly failure is being tracked in rust-lang/rust#125319. As such, I'll workaround by updating dependencies.

[weihanglo]

@bors r+

Thanks for doing all the messy works.

[bors]

:pushpin: Commit 67aa7042159cfaa8caec0fa94658f7f9b49d1b2c has been approved by weihanglo

It is now in the queue for this repository.

[bors]

:hourglass: Testing commit 67aa7042159cfaa8caec0fa94658f7f9b49d1b2c with merge 92f61d07d80a9a5af0329b7ebb0727f8f24f8e9a...

[bors]

:sunny: Test successful - checks-actions Approved by: weihanglo Pushing 92f61d07d80a9a5af0329b7ebb0727f8f24f8e9a to rust-1.79.0...