CLN: remove python2 file encodings

[topper-123]

• xref CLN: remove PY2 #25725

Remove usage of # coding=utf-8 pattern from code base.

[WillAyd]

OK by me. For Cython it looks like default is UTF8 as well:

http://docs.cython.org/en/latest/src/tutorial/strings.html#source-code-encoding

Should be OK to remove from any file ending in .pyx or .pxi.in

[WillAyd]

Probably worth deleting leading whitespace (applicable in a few modules)

[topper-123]

Ok, slightly confusing comment coming:

I saw that just after pushing, and was working with -# coding=utf-8 at the time, so I changed this PR to deal with that (including dealing with whitespace).

[codecov]

Codecov Report

Merging #26196 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26196      +/-   ##
==========================================
- Coverage   91.98%   91.98%   -0.01%     
==========================================
  Files         175      175              
  Lines       52372    52365       -7     
==========================================
- Hits        48176    48166      -10     
- Misses       4196     4199       +3

Flag	Coverage Δ
#multiple	90.53% <ø> (-0.01%)	⬇️
#single	40.69% <ø> (-0.16%)	⬇️

Impacted Files	Coverage Δ
pandas/core/strings.py	98.86% <ø> (ø)	⬆️
pandas/io/formats/format.py	97.9% <ø> (-0.01%)	⬇️
pandas/core/accessor.py	98.79% <ø> (-0.02%)	⬇️
pandas/io/formats/csvs.py	98.19% <ø> (-0.02%)	⬇️
pandas/core/internals/blocks.py	94.08% <ø> (ø)	⬆️
pandas/_libs/__init__.py	100% <ø> (ø)	⬆️
pandas/core/internals/concat.py	96.48% <ø> (ø)	⬆️
pandas/_libs/tslibs/__init__.py	100% <ø> (ø)	⬆️
pandas/core/arrays/period.py	98.53% <ø> (ø)	⬆️
pandas/io/formats/html.py	99.36% <ø> (-0.01%)	⬇️
... and 13 more

---

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[codecov]

Codecov Report

Merging #26196 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26196      +/-   ##
==========================================
- Coverage   91.98%   91.98%   -0.01%     
==========================================
  Files         175      175              
  Lines       52372    52372              
==========================================
- Hits        48176    48172       -4     
- Misses       4196     4200       +4

Flag	Coverage Δ
#multiple	90.53% <ø> (ø)	⬆️
#single	40.7% <ø> (-0.15%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
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 d74901b...2da1c2a. Read the comment docs.

[jreback]

thanks @topper-123