Migrate to py3 style type annotation: sphinx.environment

[tk0miya]

Feature or Bugfix

• Refactoring

Purpose

• refs: Move to python3 style type annotation #6413

[codecov]

Codecov Report

Merging #6552 into 2.0 will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              2.0    #6552      +/-   ##
==========================================
+ Coverage   83.75%   83.77%   +0.01%     
==========================================
  Files         266      266              
  Lines       40740    40787      +47     
  Branches     5979     5979              
==========================================
+ Hits        34121    34168      +47     
  Misses       5297     5297              
  Partials     1322     1322

Impacted Files	Coverage Δ
sphinx/environment/collectors/dependencies.py	76.66% <100%> (+3.58%)	⬆️
sphinx/util/__init__.py	70.37% <100%> (ø)	⬆️
sphinx/environment/adapters/asset.py	100% <100%> (ø)	⬆️
sphinx/environment/__init__.py	77.3% <100%> (+0.87%)	⬆️
sphinx/environment/adapters/toctree.py	86.91% <100%> (+0.13%)	⬆️
sphinx/environment/collectors/title.py	90.32% <100%> (+1.03%)	⬆️
sphinx/environment/collectors/asset.py	88.63% <100%> (+0.54%)	⬆️
sphinx/environment/collectors/metadata.py	86.48% <100%> (+1.19%)	⬆️
sphinx/environment/collectors/indexentries.py	93.33% <100%> (+1.02%)	⬆️
sphinx/environment/collectors/__init__.py	80.95% <100%> (+4.48%)	⬆️
... and 2 more

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