Fix gcps type for newer rioxarray versions

[mraspaud]

This PR introduces a fix for the backwards incompatibility introduced in corteva/rioxarray#787, and thus should make the tests for SAR pass again.

[pnuu]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.78%. Comparing base (2bd607a) to head (ad353f0).
Report is 349 commits behind head on main.

Files with missing lines	Patch %	Lines
satpy/readers/sar_c_safe.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2837      +/-   ##
==========================================
- Coverage   95.78%   95.78%   -0.01%     
==========================================
  Files         366      366              
  Lines       53521    53507      -14     
==========================================
- Hits        51267    51252      -15     
- Misses       2254     2255       +1     

Flag	Coverage Δ
behaviourtests	4.04% <0.00%> (-0.01%)	⬇️
unittests	95.88% <87.50%> (-0.01%)	⬇️

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[djhoese]

This is marked as enhancement, should it be bug fix? It is a "compatibility" fix technically right?

[mraspaud]

This is marked as enhancement, should it be bug fix? It is a "compatibility" fix technically right?

I was seeing it as an enhancement as it is not a bug in satpy... but I'm not picky, bug works if you prefer it.

[djhoese]

Yeah it could be seen either way. I guess it depends what you want it released as.