TST: Fix transformer area of interest tests

[snowman2]

• Closes TST: transformer__area_of_interest tests failing with PROJ 9.5 #1432

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.28%. Comparing base (efa3faa) to head (cdde165).
Report is 40 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1433      +/-   ##
==========================================
- Coverage   96.40%   96.28%   -0.13%     
==========================================
  Files          20       20              
  Lines        1810     1830      +20     
==========================================
+ Hits         1745     1762      +17     
- Misses         65       68       +3     

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