Remove isort dependency

[aminalaee]

Looks like isort was removed as a dependency since ruff was used with isort config, but somehow it got back in the dependencies.

Description

Removes isort from dependencies and Makefile.

Related Issues

Checklist

• Is this code covered by new or existing unit tests or integration tests?
• Did you run make test successfully?
• Do new classes, functions, methods and parameters all have docstrings?
• Were existing docstrings updated, if necessary?
• Was external documentation updated, if necessary?

Additional Notes or Comments

[codecov-commenter]

Codecov Report

Attention: 48 lines in your changes are missing coverage. Please review.

Comparison is base (34830a7) 80.33% compared to head (cd78876) 80.62%.
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1251      +/-   ##
==========================================
+ Coverage   80.33%   80.62%   +0.28%     
==========================================
  Files          95       97       +2     
  Lines        6602     6684      +82     
==========================================
+ Hits         5304     5389      +85     
+ Misses       1298     1295       -3     

Files	Coverage Δ
superduperdb/base/config.py	100.00% <ø> (ø)
superduperdb/components/model.py	93.66% <100.00%> (+11.00%)	⬆️
superduperdb/ext/openai/model.py	96.09% <ø> (+0.64%)	⬆️
superduperdb/ext/torch/model.py	76.80% <ø> (ø)
superduperdb/misc/superduper.py	76.25% <ø> (ø)
superduperdb/base/build.py	65.85% <66.66%> (-1.65%)	⬇️
superduperdb/base/logger.py	86.95% <80.00%> (-3.05%)	⬇️
superduperdb/cli/serve.py	39.28% <50.00%> (+4.28%)	⬆️
superduperdb/cli/stack.py	55.55% <55.55%> (ø)
superduperdb/components/stack.py	41.53% <41.53%> (ø)

... and 5 files with indirect coverage changes

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[jieguangzhou]

LGTM