fix(coercion): datetime tz aware into another timezone

[gjeusel]

Fix a coercion bug on an already localized DateTime.
Instead of applying a failing tz_localize, just convert the timezone using tz_convert.

Introduced by #1057

[cosmicBboy]

hi @gjeusel thanks for the PR!

Can you update the the PR description to give a high-level overview of what bug this fixes?

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (76bfa4f) 97.45% compared to head (3685042) 97.46%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1147   +/-   ##
=======================================
  Coverage   97.45%   97.46%           
=======================================
  Files          67       67           
  Lines        4840     4844    +4     
=======================================
+ Hits         4717     4721    +4     
  Misses        123      123           

Impacted Files	Coverage Δ
pandera/engines/pandas_engine.py	97.56% <100.00%> (+0.02%)	⬆️

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[gjeusel]

Can you update the the PR description to give a high-level overview of what bug this fixes?

Hey hey ! Like so ? Or you had something else in mind ?

[cosmicBboy]

thanks @gjeusel, and congrats on your first PR to pandera! 🎉