Type annotation pandas/compat/pickle compat.py

[vaibhavhrt]

• closes Fix Type Annotation in pandas.compat.pickle_compat #25988
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[codecov]

Codecov Report

Merging #25991 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #25991      +/-   ##
==========================================
- Coverage   91.86%   91.85%   -0.01%     
==========================================
  Files         175      175              
  Lines       52543    52543              
==========================================
- Hits        48267    48263       -4     
- Misses       4276     4280       +4

Flag	Coverage Δ
#multiple	90.4% <100%> (ø)	⬆️
#single	41.9% <100%> (-0.08%)	⬇️

Impacted Files	Coverage Δ
pandas/compat/pickle_compat.py	76.38% <100%> (ø)	⬆️
pandas/io/gbq.py	75% <0%> (-12.5%)	⬇️
pandas/core/frame.py	96.79% <0%> (-0.12%)	⬇️

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[jreback]

thanks @vaibhavhrt