CLN: remove unused TimeGrouper._get_binner_for_resample() method

[winklerand]

• tests passed
• passes git diff upstream/master --name-only -- '*.py' | flake8 --diff
• whatsnew entry

method seems unused and is not covered by tests -> remove it?

[codecov]

Codecov Report

Merging #16152 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #16152      +/-   ##
==========================================
+ Coverage   90.83%   90.85%   +0.01%     
==========================================
  Files         159      159              
  Lines       50796    50785      -11     
==========================================
  Hits        46143    46143              
+ Misses       4653     4642      -11

Flag	Coverage Δ
#multiple	88.64% <ø> (+0.01%)	⬆️
#single	40.32% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/core/resample.py	96.06% <ø> (+1.6%)	⬆️
pandas/core/common.py	91.03% <0%> (+0.34%)	⬆️

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[jreback]

thanks, don't remember fully what I added this.

[jreback]

this was replaced by _get_binner which dispatched to the correct subclass.