[4.6] #5636 Fix ordering of sys modules snapshot

[asottile]

#5636

[codecov]

Codecov Report

Merging #5637 into 4.6-maintenance will increase coverage by 0.25%.
The diff coverage is 100%.

@@                 Coverage Diff                 @@
##           4.6-maintenance    #5637      +/-   ##
===================================================
+ Coverage            95.91%   96.16%   +0.25%     
===================================================
  Files                  115      115              
  Lines                26504    26504              
  Branches              2613     2613              
===================================================
+ Hits                 25420    25488      +68     
+ Misses                 757      707      -50     
+ Partials               327      309      -18

Impacted Files	Coverage Δ
testing/test_pytester.py	89.57% <100%> (ø)	⬆️
src/_pytest/fixtures.py	97.55% <0%> (+0.27%)	⬆️
testing/test_capture.py	99.25% <0%> (+0.29%)	⬆️
testing/test_terminal.py	99.84% <0%> (+0.31%)	⬆️
testing/test_config.py	99.83% <0%> (+0.33%)	⬆️
src/_pytest/pytester.py	91.66% <0%> (+0.42%)	⬆️
src/_pytest/assertion/rewrite.py	95.77% <0%> (+0.48%)	⬆️
testing/python/fixtures.py	99.09% <0%> (+0.56%)	⬆️
src/_pytest/junitxml.py	95.9% <0%> (+0.58%)	⬆️
testing/acceptance_test.py	97.62% <0%> (+0.59%)	⬆️
... and 10 more

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