Fix for Jupyter Notebook CI

[freemansw1]

Resolves #339 and fixes our Jupyter Notebook CI by switching the dependency installer to mamba from conda. Also fixed a bug with our requirements that did not explicitly require h5netcdf which is required for the example that uses s3 to work.

• Have you followed our guidelines in CONTRIBUTING.md?
• Have you self-reviewed your code and corrected any misspellings?
• Have you written documentation that is easy to understand?
• Have you written descriptive commit messages?
• Have you added NumPy docstrings for newly added functions?
• Have you formatted your code using black?
• If you have introduced a new functionality, have you added adequate unit tests?
• Have all tests passed in your local clone?
• If you have introduced a new functionality, have you added an example notebook?
• Have you kept your pull request small and limited so that it is easy to review?
• Have the newest changes from this branch been merged?

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (0a695fc) 55.74% compared to head (63f9205) 55.74%.

Additional details and impacted files

@@               Coverage Diff               @@
##           RC_v1.5_hotfix     #340   +/-   ##
===============================================
  Coverage           55.74%   55.74%           
===============================================
  Files                  15       15           
  Lines                3310     3310           
===============================================
  Hits                 1845     1845           
  Misses               1465     1465           

Flag	Coverage Δ
unittests	55.74% <ø> (ø)

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[w-k-jones]

Looks good. At some point we should also look into caching CI environments

[freemansw1]

Looks good. At some point we should also look into caching CI environments

Agreed. This is just a hotfix for now. I will say though that the installing environments step isn't the largest time suck (about 3 minutes with mamba now on the example notebooks).

[fsenf]

I also confirm that everything looks fine! However, we need to keep an eye on notebook CI in future

1. It will become bigger soon
2. mamba is still experimental (see warming in CI summary)

[fsenf]

@freemansw1 : You can go ahead and merge now!