Fix issue 255: implement patches for pre-release channels

[dennisvang]

This is an attempt to fix the implementation of patches for pre-release channels, as discussed in issue #255 .

[codecov[bot]]

Codecov Report

Merging #310 (b0e8416) into main (7093d76) will decrease coverage by 0.68%. The diff coverage is 93.03%.

:exclamation: Current head b0e8416 differs from pull request most recent head f45550c. Consider uploading reports for the commit f45550c to get more accurate results

@@            Coverage Diff             @@
##             main     #310      +/-   ##
==========================================
- Coverage   88.14%   87.45%   -0.69%     
==========================================
  Files          26       26              
  Lines        2336     2312      -24     
==========================================
- Hits         2059     2022      -37     
- Misses        277      290      +13     

Impacted Files	Coverage Δ
pyupdater/client/__init__.py	89.21% <88.63%> (+0.84%)	:arrow_up:
pyupdater/core/package_handler/package.py	85.45% <89.65%> (+3.01%)	:arrow_up:
pyupdater/client/patcher.py	83.58% <90.47%> (+0.90%)	:arrow_up:
pyupdater/client/updates.py	76.39% <92.30%> (-13.79%)	:arrow_down:
pyupdater/core/package_handler/__init__.py	90.82% <92.30%> (-0.38%)	:arrow_down:
pyupdater/cli/options.py	100.00% <100.00%> (ø)
pyupdater/core/key_handler/keys.py	83.17% <100.00%> (ø)
pyupdater/core/package_handler/patch.py	86.79% <100.00%> (ø)
pyupdater/settings.py	100.00% <100.00%> (ø)
pyupdater/utils/__init__.py	85.28% <100.00%> (+0.24%)	:arrow_up:
... and 7 more

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