Drop python 3.7 support, bump Scipy, Pint, h5py requirements

[ajjackson]

Closes #278

This PR should focus on mechanics of version bump; subsequent PRs can introduce new goodies.

[codecov-commenter]

Codecov Report

Merging #284 (a0ec26e) into master (7f58868) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master     #284   +/-   ##
=======================================
  Coverage   95.78%   95.78%           
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  Files          28       28           
  Lines        3958     3958           
  Branches      798      798           
=======================================
  Hits         3791     3791           
  Misses         98       98           
  Partials       69       69           

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[github-actions]

Test Results

       28 files  +       9         28 suites  +9   1h 33m 18s ⏱️ + 59m 36s
  1 040 tests ±       0    1 034 ✔️ ±       0    6 💤 ±  0  0 ❌ ±0 
16 544 runs  +9 306  16 445 ✔️ +9 252  99 💤 +54  0 ❌ ±0 

Results for commit a0ec26e. ± Comparison against base commit 7f58868.

♻️ This comment has been updated with latest results.

[ajjackson]

Strange things happening on Windows seem to be resolved if we stay on 3.7 as the host version for tox. That's a bit silly but solves the immediate issue for minimal effort. Playing more with tox and github actìons may have to wait until next year!

[ajjackson]

Thanks for speedy review! I'll just call the CI manually to make sure 3.9 and 3.10 are happy before merging.

https://github.com/pace-neutrons/Euphonic/actions/runs/6047171355

[ajjackson]

Tests look fine 🚀