.coveragerc: use "src" only from current dir

[blueyed]

No description provided.

[codecov]

Codecov Report

Merging #4983 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #4983      +/-   ##
=========================================
+ Coverage   95.69%   95.7%   +0.01%     
=========================================
  Files         113     113              
  Lines       25178   25178              
  Branches     2498    2498              
=========================================
+ Hits        24093   24097       +4     
+ Misses        766     763       -3     
+ Partials      319     318       -1

Impacted Files	Coverage Δ
src/_pytest/cacheprovider.py	95.75% <0%> (-1.42%)	⬇️
src/_pytest/capture.py	94.38% <0%> (+0.44%)	⬆️
src/_pytest/terminal.py	91.74% <0%> (+0.82%)	⬆️

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