update codecov uploader to start getting coverage reports

[JessicaS11]

At some point we stopped getting code testing coverage reports (it was failing silently in Travis CI). This PR updates to use the most recent uploader. Addresses #485.

References:

• https://docs.codecov.com/docs/codecov-uploader#integrity-checking-the-uploader

[github-actions[bot]]

:point_left: Launch a binder notebook on this branch for commit 9b45e9f8528c5d7dedfa9f8c7b8b883655a239e8

I will automatically update this comment whenever this PR is modified

[codecov[bot]]

Codecov Report

Attention: 254 lines in your changes are missing coverage. Please review.

Comparison is base (d9a9d94) 59.09% compared to head (9b45e9f) 66.09%. Report is 44 commits behind head on development.

Files	Patch %	Lines
icepyx/core/read.py	26.59%	68 Missing and 1 partial :warning:
icepyx/core/is2ref.py	32.72%	37 Missing :warning:
icepyx/core/variables.py	26.82%	30 Missing :warning:
icepyx/quest/dataset_scripts/argo.py	79.59%	22 Missing and 8 partials :warning:
icepyx/quest/quest.py	49.09%	28 Missing :warning:
icepyx/core/query.py	69.23%	13 Missing and 7 partials :warning:
icepyx/core/auth.py	76.74%	7 Missing and 3 partials :warning:
icepyx/core/temporal.py	91.30%	4 Missing and 4 partials :warning:
icepyx/core/granules.py	22.22%	6 Missing and 1 partial :warning:
icepyx/tests/test_behind_NSIDC_API_login.py	0.00%	7 Missing :warning:
... and 4 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## development #496 +/- ## =============================================== + Coverage 59.09% 66.09% +7.00% =============================================== Files 30 36 +6 Lines 2264 3115 +851 Branches 488 552 +64 =============================================== + Hits 1338 2059 +721 - Misses 843 963 +120 - Partials 83 93 +10 ```

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