Update python requirements

[WilliamJamieson]

This PR updates the python requirements and CI.

Fixes #49

[codecov[bot]]

Codecov Report

Merging #50 (d665668) into main (28d24b5) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #50   +/-   ##
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  Coverage   79.86%   79.86%           
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  Files           4        4           
  Lines         298      298           
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  Hits          238      238           
  Misses         60       60           

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[WilliamJamieson]

I give up, on fixing the linuxgcc CI. @Cadair do you know how to fix this?

[astrofrog]

I can try and look into this on Monday

[astrofrog]

The conda issue appears to have resolved itself, so I am just fixing a couple of deprecations and will get this merged once the CI passes.

[astrofrog]

The SunPy test failure is unrelated, so I'll go ahead and merge