TST add test for random fraction to keep

[beckermr]

xref: conda-forge/aws-sdk-cpp-feedstock#662

This test confirms the current code works if it finds the version. It should have shipped 1.11.132 last week but did not. Thus I think this means that the bot did not find the version. I will check that next

[beckermr]

cc @h-vetinari

[codecov]

Codecov Report

Patch coverage: 80.35% and project coverage change: +0.38% 🎉

Comparison is base (32b9c6a) 67.81% compared to head (99ab6b8) 68.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1787      +/-   ##
==========================================
+ Coverage   67.81%   68.20%   +0.38%     
==========================================
  Files          90       90              
  Lines        8555     8600      +45     
==========================================
+ Hits         5802     5866      +64     
+ Misses       2753     2734      -19     

Files Changed	Coverage Δ
conda_forge_tick/update_upstream_versions.py	33.57% <35.71%> (-0.81%)	⬇️
tests/test_upstream_versions.py	89.15% <88.23%> (+2.01%)	⬆️
conda_forge_tick/migrators/version.py	65.96% <100.00%> (+4.06%)	⬆️
conda_forge_tick/update_sources.py	67.56% <100.00%> (+5.30%)	⬆️
tests/test_version_migrator.py	98.24% <100.00%> (+0.68%)	⬆️

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