enable unyt 3.0 and update action versions

[chrishavlin]

Closes #43

[codecov]

Codecov Report

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

Comparison is base (0f9a133) 99.89% compared to head (c6036e6) 99.68%.
Report is 1 commits behind head on main.

❗ Current head c6036e6 differs from pull request most recent head 9cec166. Consider uploading reports for the commit 9cec166 to get more accurate results

Files	Patch %	Lines
pyVBRc/tests/test_pyVBRc.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
- Coverage   99.89%   99.68%   -0.21%     
==========================================
  Files          12       12              
  Lines         953      959       +6     
==========================================
+ Hits          952      956       +4     
- Misses          1        3       +2     

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