Various changes

[bwohlberg]

Various changes, including:

• Improvements to the conda environment creation script
• Updates to documentation related to installing a version of jax with GPU support
• Replacement of jax.experimental.host_callback.call (which is pending deprecation, and no longer seems to function properly on GPU devices) with jax.pure_callback
• Address very slow tests for svmbir interface
• Bump maximum allowed jaxlib and jax versions

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (4eb21c1) 94.46% compared to head (87c2bef) 94.37%.

Files	Patch %	Lines
scico/linop/xray/astra.py	84.62%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #487      +/-   ##
==========================================
- Coverage   94.46%   94.37%   -0.09%     
==========================================
  Files          91       91              
  Lines        5664     5665       +1     
==========================================
- Hits         5350     5346       -4     
- Misses        314      319       +5     

Flag	Coverage Δ
unittests	94.37% <89.47%> (-0.09%)	⬇️

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