Typo on flatten-dict dependency

[weiji14]

Should be flatten-dict with a hyphen instead of underscore according to https://pypi.org/project/flatten-dict and https://github.com/ianlini/flatten-dict.

This has been tripping up the conda-forge auto-update bot since conda-forge/dvc-feedstock@6d439cf (had to manually remove flatten_dict in favour of flatten-dict).

• ❗ I have followed the Contributing to DVC checklist.

• 📖 If this PR requires documentation updates, I have created a separate PR (or issue, at least) in dvc.org and linked it here.

Thank you for the contribution - we'll try to review it as soon as possible. 🙏

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.98%. Comparing base (2431ec6) to head (1090e12).
⚠️ Report is 181 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10953      +/-   ##
==========================================
+ Coverage   90.68%   90.98%   +0.30%     
==========================================
  Files         504      505       +1     
  Lines       39795    41083    +1288     
  Branches     3141     3255     +114     
==========================================
+ Hits        36087    37380    +1293     
- Misses       3042     3064      +22     
+ Partials      666      639      -27     

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[skshetry]

@weiji14, in Python packaging, flatten_dict and flatten-dict are equal and gets normalized to flatten-dict. See Name Normalization. Could this be a bug in grayskull?

That said, I am okay with this changes.

[weiji14]

Ah, didn't know that PyPI/pip handled that! Yes, conda is more sensitive (since it is not Python only). I did find conda/grayskull#228 and conda/grayskull#230 (comment), but those don't seemed to be actioned yet, so would prefer if we use flatten-dict with hyphen here 🙏

[skshetry]

Thank you @weiji14 for fixing this, and also helping to migrate conda recipe to v1 format. 🙏🏽