Stop to access env.versionchanged because of deprecated

[tk0miya]

Feature or Bugfix

• Bugfix

Purpose

• Stop to emit DeprecationWarning on parallel build

[codecov]

Codecov Report

Merging #6120 into 2.0 will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              2.0    #6120      +/-   ##
==========================================
- Coverage   82.69%   82.69%   -0.01%     
==========================================
  Files         269      269              
  Lines       39147    39145       -2     
  Branches     5850     5848       -2     
==========================================
- Hits        32371    32369       -2     
+ Misses       5442     5440       -2     
- Partials     1334     1336       +2

Impacted Files	Coverage Δ
sphinx/environment/__init__.py	76.17% <ø> (+0.41%)	⬆️
sphinx/transforms/post_transforms/images.py	64.7% <0%> (-1.31%)	⬇️

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