Fix leaked semaphore issue on mac

[AbhinavTuli]

🚀 🚀 Pull Request

Checklist:

• My code follows the style guidelines of this project and the Contributing document
• I have commented my code, particularly in hard-to-understand areas
• I have kept the coverage-rate up
• I have performed a self-review of my own code and resolved any problems
• I have checked to ensure there aren't any other open Pull Requests for the same change
• I have described and made corresponding changes to the relevant documentation
• New and existing unit tests pass locally with my changes

Changes

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #1291 (1586733) into main (9aa6a19) will decrease coverage by 0.08%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main    #1291      +/-   ##
==========================================
- Coverage   90.90%   90.81%   -0.09%     
==========================================
  Files         146      146              
  Lines       10474    10478       +4     
==========================================
- Hits         9521     9516       -5     
- Misses        953      962       +9     

Flag	Coverage Δ
unittests	90.81% <75.00%> (-0.09%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
hub/__init__.py	96.96% <75.00%> (-3.04%)	⬇️
hub/core/lock.py	82.22% <0.00%> (-8.89%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9aa6a19...1586733. Read the comment docs.

[aliubimov]

Please, rebase on top of feature/refactor-pytorch