Fix CI dependency issue with aiohttp and async-timeout

[puddly]

It seems like uv is preferring our explicit dependency on async-timeout being the highest version to picking one compatible with aiohttp. This results in an ancient version of the latter package being installed.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 43.75000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 65.61%. Comparing base (b009196) to head (806c6b8).
Report is 9 commits behind head on dev.

Files with missing lines	Patch %	Lines
universal_silabs_flasher/gecko_bootloader.py	25.00%	3 Missing ⚠️
universal_silabs_flasher/flasher.py	33.33%	2 Missing ⚠️
universal_silabs_flasher/common.py	66.66%	1 Missing ⚠️
universal_silabs_flasher/cpc.py	50.00%	1 Missing ⚠️
universal_silabs_flasher/spinel.py	50.00%	1 Missing ⚠️
universal_silabs_flasher/xmodemcrc.py	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #88      +/-   ##
==========================================
+ Coverage   61.78%   65.61%   +3.82%     
==========================================
  Files          14       14              
  Lines        1748     1736      -12     
==========================================
+ Hits         1080     1139      +59     
+ Misses        668      597      -71     

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