Pin the pre-commit hook hashes

[peytondmurray]

Issue number of the reported bug or feature request: Closes #293.

Describe your changes
This PR pins (and updates) the pre-commit hooks using commit hashes rather than (potentially mutable) git refs. For future reference, the command used here was pre-commit autoupdate --freeze.

Testing performed
No testing required.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.54930% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.19%. Comparing base (debc9e8) to head (257f103).

Files with missing lines	Patch %	Lines
src/pystack/_pystack/corefile.cpp	0.00%	2 Missing ⚠️
src/pystack/_pystack/corefile.h	0.00%	1 Missing ⚠️
src/pystack/_pystack/pytypes.cpp	0.00%	1 Missing ⚠️
src/pystack/_pystack/unwinder.h	0.00%	1 Missing ⚠️
tests/utils.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #294   +/-   ##
=======================================
  Coverage   79.19%   79.19%           
=======================================
  Files          51       51           
  Lines        5542     5542           
  Branches      577      580    +3     
=======================================
  Hits         4389     4389           
  Misses       1153     1153           

Flag	Coverage Δ
cpp	79.19% <91.54%> (ø)
python	79.19% <91.54%> (ø)

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[peytondmurray]

It looks like the newly updated pre-commit hooks resulted in a few formatting changes, some of which hit example python files used by tests. This means that there are some line number changes for a few of the integration tests. These should now be up to date with the latest changes 👍

[peytondmurray]

Does it make sense to write a news entry for this?

[sarahmonod]

Does it make sense to write a news entry for this?

Nope, I've added the skip news label for it.