BUG: Handle changes to HotineObliqueMercatorBConversion

[snowman2]

• Closes TST: test_oblique_mercator_losing_gamma fails with latest PROJ #1429
• Tests added
• Fully documented, including history.rst for all changes and api/*.rst for new API

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 96.28%. Comparing base (efa3faa) to head (4a3c89f).
Report is 36 commits behind head on main.

Files with missing lines	Patch %	Lines
pyproj/crs/_cf1x8.py	50.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1430      +/-   ##
==========================================
- 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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