Fix inconsistencies in rustfmt editions on CI and local

[clux]

We should be using at least edition 2021 everywhere.

(Noticed in https://github.com/kube-rs/kube/pull/1644)

Also allowlists a red deny error from two different version of rustls-native-certs, the oldest of which is pulled in by hyper-http-proxy.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 75.5%. Comparing base (08ccc47) to head (5e8341c). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1646 +/- ## ===================================== Coverage 75.5% 75.5% ===================================== Files 82 82 Lines 7403 7403 ===================================== Hits 5589 5589 Misses 1814 1814 ```

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