Bump MSRV from 1.88.0 to 1.94.0

[Jefffrey]

see previous bump

• Bump MSRV to 1.88.0 #18403

honestly my main motivation was i was using a feature from 1.89.0 apparently for #23631 and realized we hadn't bumped this in a while

if we prefer to be more conservative with msrv bumps (i.e. only bump if a dependency requires it or we see a really useful feature/lib function in newer versions) then i'm fine with leaving it and altering my PR above, but in the past we usually kept up to date with bumping our msrv

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@           Coverage Diff           @@
##             main   #23632   +/-   ##
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  Coverage        ?   80.65%           
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  Files           ?     1086           
  Lines           ?   366097           
  Branches        ?   366097           
=======================================
  Hits            ?   295271           
  Misses          ?    53233           
  Partials        ?    17593           

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[neilconway]

Personally I'm okay with bumping MSRV more aggressively, but I don't know if we have a policy on it.