update oceanspy_test environment

[Mikejmnez]

Thanks to @MaceKuailv who figure out that there is an issue with matplotlib version > 3.5.2. See issue #269 for a description. Pinning down allows all tests to pass in my testing environment. It is also the reason the previous PR #268 passed (we looked and the ci/environment used an even older version of matplotlib, which is why all tests passed. We don't know why it used an older matplotlib version though, but that is a separate issue).

This PR also unpins xarray, since tests ran fine within the new oceanspy_test environment which does not pin xarray . If there is an issue then we can figure out later, but so far all tests passed on my oceanspy_test environment.

Lets see if things go well...

[codecov[bot]]

Codecov Report

Merging #270 (0bd5abd) into main (0ded3fa) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #270   +/-   ##
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  Coverage   95.36%   95.36%           
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  Files          10       10           
  Lines        3842     3842           
  Branches      811      811           
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  Hits         3664     3664           
  Misses        114      114           
  Partials       64       64           

Flag	Coverage Δ
unittests	95.36% <ø> (ø)

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[Mikejmnez]

CI again builds the testing environment with an older version of matplotlib (version 3.3.2) than necessary, but that may be related to a compatibility issue unrelated to oceanspy. In my computer, the oceanspy_test installs matplotlib version 3.5.2.