BUG: DataFrame.update with tz-aware date doesn't return naive data

[mroeschke]

• closes BUG: DataFrame.update() drops timezone info #25807
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[codecov]

Codecov Report

Merging #25810 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #25810   +/-   ##
=======================================
  Coverage   91.27%   91.27%           
=======================================
  Files         173      173           
  Lines       53002    53002           
=======================================
  Hits        48375    48375           
  Misses       4627     4627

Flag	Coverage Δ
#multiple	89.83% <100%> (ø)	⬆️
#single	41.77% <0%> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/core/frame.py	96.79% <100%> (ø)	⬆️

---

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[codecov]

Codecov Report

Merging #25810 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #25810   +/-   ##
=======================================
  Coverage   91.27%   91.27%           
=======================================
  Files         173      173           
  Lines       53002    53002           
=======================================
  Hits        48375    48375           
  Misses       4627     4627

Flag	Coverage Δ
#multiple	89.83% <100%> (ø)	⬆️
#single	41.77% <0%> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/core/frame.py	96.79% <100%> (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 fbe2523...116e8dd. Read the comment docs.

[WillAyd]

lgtm

[jreback]

thanks @mroeschke

I think this might close one or more outstanding update issues (other than the OP of course)