COMPAT: Change pandas use_inf_as_null to reflect 2.0 deprecation

[mroeschke]

pandas 2.0 will enforce the deprecation of the option use_inf_as_null in favor of use_if_as na, so changing the usages I found in seaborn

[codecov]

Codecov Report

Merging #3177 (6253ee6) into master (ba786bc) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3177   +/-   ##
=======================================
  Coverage   98.41%   98.41%           
=======================================
  Files          76       76           
  Lines       24082    24082           
=======================================
  Hits        23701    23701           
  Misses        381      381           

Impacted Files	Coverage Δ
seaborn/_core/plot.py	99.33% <100.00%> (ø)
seaborn/_oldcore.py	97.67% <100.00%> (ø)
seaborn/categorical.py	98.54% <100.00%> (ø)

[mwaskom]

Thanks!