Fix inconsistencies in rustfmt editions on CI and local

[clux]

We should be using at least edition 2021 everywhere.

(Noticed in #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]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

@@          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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