Fix a problem where fetched and cached images could not be resized by allowing file caches to use file name suffixes

[bartfeenstra]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 7 lines in your changes missing coverage. Please review.

Project coverage is 98.19%. Comparing base (4c4f73d) to head (8d0cf40).
Report is 1 commits behind head on 0.4.x.

Files with missing lines	Patch %	Lines
betty/cache/file.py	83.33%	2 Missing and 1 partial ⚠️
betty/cache/_base.py	84.61%	2 Missing ⚠️
betty/fetch/http.py	81.81%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            0.4.x    #2269      +/-   ##
==========================================
- Coverage   98.22%   98.19%   -0.03%     
==========================================
  Files         365      365              
  Lines       23227    23244      +17     
  Branches     1075     1077       +2     
==========================================
+ Hits        22814    22824      +10     
- Misses        263      268       +5     
- Partials      150      152       +2     

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