[CI]: Compare vs. last commit in black CI action

[sneakers-the-rat]

Motivation

Noticed that black wasn't being run in https://github.com/hdmf-dev/hdmf-zarr/actions/runs/7335433157/job/19973345812#step:4:66 , presumably because at the time of a PR the changes have already been committed, see https://pre-commit.com/#usage-in-continuous-integration

I assume it's intended to check if PRs are black-compliant? but isn't currently doing that. I ran a manual check of black and it looks like most of the package isn't either, so this will cause all other PRs to fail until upstream has been black reformatted.

How to test the behavior?

make new PR, make black-noncompliant changes, tests should fail.

Checklist

• Did you update CHANGELOG.md with your changes?
• Have you checked our Contributing document?
• Have you ensured the PR clearly describes the problem and the solution?
• Is your contribution compliant with our coding style? This can be checked running ruff from the source directory.
• Have you checked to ensure that there aren't other open Pull Requests for the same change?
• Have you included the relevant issue number using "Fix #XXX" notation where XXX is the issue number? By including "Fix #XXX" you allow GitHub to close issue #XXX when the PR is merged.

[rly]

After #153 and #146 have been merged, @mavaylon1 can you reformat the repo using black and push those changes in a separate PR?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9692a98) 84.51% compared to head (5d974a4) 84.51%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #151   +/-   ##
=======================================
  Coverage   84.51%   84.51%           
=======================================
  Files           5        5           
  Lines        1104     1104           
  Branches      296      296           
=======================================
  Hits          933      933           
  Misses        115      115           
  Partials       56       56           

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[mavaylon1]

After #153 and #146 have been merged, @mavaylon1 can you reformat the repo using black and push those changes in a separate PR?

Sure thing