refactor: replace os.path to pathlib (#1981)

[XDRAGON2002]

Closes #1981

[codecov-commenter]

Codecov Report

Merging #2016 (bab7bfa) into main (b6632d6) will decrease coverage by 7.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2016      +/-   ##
==========================================
- Coverage   85.04%   78.00%   -7.05%     
==========================================
  Files         335      335              
  Lines        7583     7583              
  Branches      989      989              
==========================================
- Hits         6449     5915     -534     
- Misses        861     1407     +546     
+ Partials      273      261      -12     

Flag	Coverage Δ
longtests	78.00% <100.00%> (-0.08%)	⬇️
win-longtests	?

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

Impacted Files	Coverage Δ
cve_bin_tool/version_signature.py	74.50% <100.00%> (ø)
test/test_requirements.py	0.00% <0.00%> (-89.88%)	⬇️
cve_bin_tool/nvd_api.py	24.00% <0.00%> (-52.80%)	⬇️
test/test_nvd_api.py	50.87% <0.00%> (-40.36%)	⬇️
test/test_source_nvd.py	60.71% <0.00%> (-39.29%)	⬇️
test/test_scanner.py	60.13% <0.00%> (-34.27%)	⬇️
test/test_source_osv.py	68.85% <0.00%> (-31.15%)	⬇️
cve_bin_tool/checkers/xml2.py	61.36% <0.00%> (-27.28%)	⬇️
cve_bin_tool/data_sources/nvd_source.py	29.18% <0.00%> (-26.49%)	⬇️
test/test_source_gad.py	73.68% <0.00%> (-24.57%)	⬇️
... and 21 more

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[terriko]

Looks good, thanks!