Fix ResourceWarning by avoiding garbage collection altogether

[youtux]

No description provided.

[codecov]

Codecov Report

Merging #5 (3c605a1) into master (5a9f359) will decrease coverage by 0.36%.
The diff coverage is 70.58%.

@@            Coverage Diff             @@
##           master       #5      +/-   ##
==========================================
- Coverage   91.86%   91.50%   -0.37%     
==========================================
  Files           8        8              
  Lines         590      600      +10     
  Branches       57       56       -1     
==========================================
+ Hits          542      549       +7     
- Misses         37       40       +3     
  Partials       11       11              

Impacted Files	Coverage Δ
tests/test_locking.py	75.96% <37.50%> (-2.26%)	⬇️
dogpile_filesystem/registry.py	100.00% <100.00%> (ø)

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