Fix pytest's own tests with -W error::ResourceWarning

[blueyed]

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[codecov]

Codecov Report

Merging #4991 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #4991      +/-   ##
=========================================
+ Coverage   95.69%   95.7%   +0.01%     
=========================================
  Files         113     113              
  Lines       25178   25178              
  Branches     2498    2498              
=========================================
+ Hits        24093   24097       +4     
+ Misses        766     764       -2     
+ Partials      319     317       -2

Impacted Files	Coverage Δ
testing/test_session.py	96.68% <ø> (ø)	⬆️
testing/python/fixture.py	99.08% <100%> (ø)	⬆️
src/_pytest/cacheprovider.py	96.69% <0%> (-0.48%)	⬇️
src/_pytest/terminal.py	91.74% <0%> (+0.82%)	⬆️

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