Bump MSRV to 1.82.0

[drinkcat]

Fixes #7393.

[sylvestre]

@cakebaker ok with you ? :)

[sylvestre]

Needs to fix:

      --> tests/common/util.rs:411:9
      |
  411 |         self.exit_status.map_or(true, |e| e.success())
      |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use is_none_or instead: `self.exit_status.is_none_or(|e| e.success())`

[cakebaker]

@sylvestre yes :)

[drinkcat]

Needs to fix:

      --> tests/common/util.rs:411:9
      |
  411 |         self.exit_status.map_or(true, |e| e.success())
      |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use is_none_or instead: `self.exit_status.is_none_or(|e| e.success())`

done

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/misc/stdbuf (passes in this run but fails in the 'main' branch)