Remove posix import

[Belval]

Fixes: #249

Unused imported was added in 1.16.1. Also need to pull the release and remove the version from PyPI.

Will need to investigate why the CI didn't raise and issue.

[codecov-commenter]

Codecov Report

Base: 96.09% // Head: 96.07% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (233bb08) compared to base (34d3461).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #250      +/-   ##
==========================================
- Coverage   96.09%   96.07%   -0.02%     
==========================================
  Files           5        5              
  Lines         307      306       -1     
==========================================
- Hits          295      294       -1     
  Misses         12       12              

Impacted Files	Coverage Δ
pdf2image/pdf2image.py	95.31% <ø> (-0.02%)	⬇️

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[Belval]

Tested on Windows, there are still two tests failing:

tests.py::PDFConversionMethods::test_conversion_from_pathlib_path_using_dir
tests.py::PDFConversionMethods::test_conversion_from_pathlib_path_using_dir_14

I will be opening an issue but I think in the meantime this is good to go.