Fix get_bounds_dim_name regression.

[dcherian]

Handle the case where lat and lat_bounds have same attributes.

Closes #442

[codecov[bot]]

Codecov Report

Merging #473 (42680ec) into main (c4d662e) will decrease coverage by 0.02%. The diff coverage is 83.33%.

@@            Coverage Diff             @@
##             main     #473      +/-   ##
==========================================
- Coverage   86.12%   86.11%   -0.02%     
==========================================
  Files          22       22              
  Lines        4209     4220      +11     
  Branches      207      210       +3     
==========================================
+ Hits         3625     3634       +9     
- Misses        527      528       +1     
- Partials       57       58       +1     

Flag	Coverage Δ
mypy	37.97% <16.66%> (-0.06%)	:arrow_down:
unittests	95.86% <100.00%> (+0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
cf_xarray/tests/test_accessor.py	94.08% <100.00%> (+0.02%)	:arrow_up:
cf_xarray/accessor.py	85.90% <71.42%> (-0.09%)	:arrow_down: