fix bbox validation

[ujjwal360]

small fix to bbox validation allowing x_min (south west longitude) to be greater than x_max (north east longitude) when crossing the anti meridian as per https://datatracker.ietf.org/doc/html/rfc7946#section-5.2

this issue was also reported in https://github.com/stac-utils/stac-pydantic/issues/122 and i am encountering the same validation error in https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch

[vincentsarago]

@ujjwal360 thanks for opening (and closing and re-opening 😅) this PR

Could you add some test for this 🙏

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.15%. Comparing base (a927d25) to head (3616d2d). Report is 81 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #167      +/-   ##
==========================================
- Coverage   96.59%   96.15%   -0.44%     
==========================================
  Files          25       25              
  Lines         587      598      +11     
==========================================
+ Hits          567      575       +8     
- Misses         20       23       +3     

Flag	Coverage Δ
unittests	96.15% <100.00%> (-0.44%)	:arrow_down:

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[ujjwal360]

@ujjwal360 thanks for opening (and closing and re-opening 😅) this PR

Could you add some test for this 🙏

thanks for the quick response @vincentsarago, i was having serious second thoughts even though its a small change! 😅 i'll add a test asap

[ujjwal360]

@vincentsarago hope test looks good

[ujjwal360]

@vincentsarago any thoughts on removing xmax < xmin check? thanks!