CLN: Remove deprecated parse_cols from read_excel

[mroeschke]

• xref DEPR: Clean up list of deprecations from prior versions #6581
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[codecov]

Codecov Report

Merging #26522 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #26522      +/-   ##
==========================================
- Coverage   91.75%   91.75%   -0.01%     
==========================================
  Files         174      174              
  Lines       50665    50664       -1     
==========================================
- Hits        46489    46485       -4     
- Misses       4176     4179       +3

Flag	Coverage Δ
#multiple	90.26% <100%> (-0.01%)	⬇️
#single	41.73% <0%> (-0.07%)	⬇️

Impacted Files	Coverage Δ
pandas/io/excel/_base.py	91.81% <100%> (-0.04%)	⬇️
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.7% <0%> (+0.1%)	⬆️

---

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[codecov]

Codecov Report

Merging #26522 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #26522      +/-   ##
==========================================
- Coverage   91.75%   91.75%   -0.01%     
==========================================
  Files         174      174              
  Lines       50665    50664       -1     
==========================================
- Hits        46489    46485       -4     
- Misses       4176     4179       +3

Flag	Coverage Δ
#multiple	90.26% <100%> (-0.01%)	⬇️
#single	41.73% <0%> (-0.07%)	⬇️

Impacted Files	Coverage Δ
pandas/io/excel/_base.py	91.81% <100%> (-0.04%)	⬇️
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.7% <0%> (+0.1%)	⬆️

---

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 ba48fc4...8f619dd. Read the comment docs.

[gfyoung]

Thanks @mroeschke !