docs: switch to RTD build.os

[tsutterley]

docs: slimmer build to prevent RTD overutilization
chore: bump version to 2.0.7

[codecov]

Codecov Report

Patch coverage: 45.00% and project coverage change: -0.05% ⚠️

Comparison is base (d123bb9) 70.22% compared to head (205edbb) 70.17%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #230      +/-   ##
==========================================
- Coverage   70.22%   70.17%   -0.05%     
==========================================
  Files          43       43              
  Lines        8987     8997      +10     
  Branches      994     1184     +190     
==========================================
+ Hits         6311     6314       +3     
- Misses       2322     2328       +6     
- Partials      354      355       +1     

Flag	Coverage Δ
unittests	70.17% <45.00%> (-0.05%)	⬇️

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

Files Changed	Coverage Δ
pyTMD/io/OTIS.py	37.38% <0.00%> (ø)
pyTMD/io/model.py	57.38% <21.73%> (ø)
pyTMD/io/constituents.py	83.63% <50.00%> (-1.27%)	⬇️
pyTMD/predict.py	92.68% <66.66%> (ø)
pyTMD/spatial.py	72.18% <75.00%> (-0.10%)	⬇️
pyTMD/tools.py	30.57% <81.81%> (+0.07%)	⬆️
pyTMD/arguments.py	99.49% <100.00%> (ø)
pyTMD/check_tide_points.py	65.62% <100.00%> (ø)
pyTMD/compute_tide_corrections.py	25.56% <100.00%> (ø)

... and 1 file with indirect coverage changes

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