Updates for numpy 2.0

[rfrenchseti]

Updates required for numpy 2.0+:

• Change np.asfarray to np.asarray(..., dtype=np.float64)
• Update requirements.txt to remove version numbers. This allows 3.8 and 3.9+ to coexist.

[codecov]

Codecov Report

Attention: Patch coverage is 56.09756% with 18 lines in your changes missing coverage. Please review.

Project coverage is 75.39%. Comparing base (bef63e7) to head (ec7493a).

Files	Patch %	Lines
oops/gravity/oblategravity.py	0.00%	16 Missing ⚠️
oops/gold_master/__init__.py	0.00%	1 Missing ⚠️
oops/surface/orbitplane.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #135   +/-   ##
=======================================
  Coverage   75.39%   75.39%           
=======================================
  Files         192      192           
  Lines       24082    24082           
  Branches     2906     2906           
=======================================
  Hits        18156    18156           
  Misses       5088     5088           
  Partials      838      838           

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