Remove file ext validation

[Nimond]

Checklist

• Linters and tests have passed
• I've written a changelog for PR change
• I'll make a release when PR is approved

[github-actions]

🚀 Deployed on https://614075c55f942216de1d43f7--pybotx.netlify.app

[codecov-commenter]

Codecov Report

Merging #185 (9930f3a) into master (81b9701) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #185   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          275       274    -1     
  Lines         6184      6158   -26     
  Branches       232       231    -1     
=========================================
- Hits          6184      6158   -26     

Impacted Files	Coverage Δ
botx/clients/clients/processing.py	100.00% <100.00%> (ø)
botx/models/files.py	100.00% <100.00%> (ø)
tests/test_models/test_files/test_attributes.py	100.00% <100.00%> (ø)

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