CLN: Remove vestigial references to PY2 in tests

[gfyoung]

xref #25725

[codecov]

Codecov Report

Merging #25865 into master will decrease coverage by 49.65%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master   #25865       +/-   ##
===========================================
- Coverage   91.47%   41.82%   -49.66%     
===========================================
  Files         173      173               
  Lines       52872    52872               
===========================================
- Hits        48366    22112    -26254     
- Misses       4506    30760    +26254

Flag	Coverage Δ
#multiple	?
#single	41.82% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/io/formats/latex.py	0% <0%> (-100%)	⬇️
pandas/io/sas/sas_constants.py	0% <0%> (-100%)	⬇️
pandas/tseries/plotting.py	0% <0%> (-100%)	⬇️
pandas/tseries/converter.py	0% <0%> (-100%)	⬇️
pandas/io/formats/html.py	0% <0%> (-99.36%)	⬇️
pandas/core/groupby/categorical.py	0% <0%> (-95.46%)	⬇️
pandas/io/sas/sas7bdat.py	0% <0%> (-91.17%)	⬇️
pandas/io/sas/sas_xport.py	0% <0%> (-90.15%)	⬇️
pandas/core/tools/numeric.py	10.44% <0%> (-89.56%)	⬇️
pandas/io/json/normalize.py	8.16% <0%> (-88.78%)	⬇️
... and 129 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #25865 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #25865   +/-   ##
=======================================
  Coverage   91.47%   91.47%           
=======================================
  Files         173      173           
  Lines       52872    52872           
=======================================
  Hits        48366    48366           
  Misses       4506     4506

Flag	Coverage Δ
#multiple	90.04% <ø> (ø)	⬆️
#single	41.82% <ø> (ø)	⬆️

---

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 9821b77...649f6ce. Read the comment docs.

[jreback]

thanks @gfyoung