respect text.style in panels

[willmcgugan]

Fixes #3493

Drops Python3.7 support

Bumps to v 13.9.0

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.

Project coverage is 98.25%. Comparing base (9c74f03) to head (7db6b63).
Report is 66 commits behind head on master.

Files with missing lines	Patch %	Lines
rich/progress.py	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3509   +/-   ##
=======================================
  Coverage   98.25%   98.25%           
=======================================
  Files          74       74           
  Lines        8072     8098   +26     
=======================================
+ Hits         7931     7957   +26     
  Misses        141      141           

Flag	Coverage Δ
unittests	98.25% <94.73%> (+<0.01%)	⬆️

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