Cython Unicode Method Cleanups

[WillAyd]

Removal of some items that should no longer be required after Py2 drop

[codecov]

Codecov Report

Merging #26138 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26138      +/-   ##
==========================================
- Coverage   91.99%   91.98%   -0.01%     
==========================================
  Files         175      175              
  Lines       52387    52385       -2     
==========================================
- Hits        48191    48186       -5     
- Misses       4196     4199       +3

Flag	Coverage Δ
#multiple	90.54% <ø> (ø)	⬆️
#single	40.74% <ø> (-0.14%)	⬇️

Impacted Files	Coverage Δ
pandas/core/dtypes/cast.py	91.5% <ø> (+0.13%)	⬆️
pandas/io/gbq.py	75% <0%> (-12.5%)	⬇️
pandas/core/frame.py	96.9% <0%> (-0.12%)	⬇️

---

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[codecov]

Codecov Report

Merging #26138 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26138      +/-   ##
==========================================
- Coverage   91.99%   91.98%   -0.01%     
==========================================
  Files         175      175              
  Lines       52387    52385       -2     
==========================================
- Hits        48191    48186       -5     
- Misses       4196     4199       +3

Flag	Coverage Δ
#multiple	90.54% <ø> (ø)	⬆️
#single	40.74% <ø> (-0.14%)	⬇️

Impacted Files	Coverage Δ
pandas/core/dtypes/cast.py	91.5% <ø> (+0.13%)	⬆️
pandas/io/gbq.py	75% <0%> (-12.5%)	⬇️
pandas/core/frame.py	96.9% <0%> (-0.12%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update dd9c585...0960a36. Read the comment docs.

[jreback]

thanks @WillAyd