Pinned versions as pyproject requirements

[mpatrou]

Short description of the changes:

pyproject.toml updated with pinned versions for some dependencies.
Also channel reordering in the environment file

Check list for the pull request

• I have read the [CONTRIBUTING]
• I have read the [CODE_OF_CONDUCT]
• I have added tests for my changes
• I have updated the documentation accordingly

Check list for the reviewer

• I have read the [CONTRIBUTING]
• I have verified the proposed changes
• best software practices
  • all internal functions have an underbar, as is python standard
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

Manual test for the reviewer

References

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.79%. Comparing base (79cc9c9) to head (a905990).

Additional details and impacted files

@@           Coverage Diff           @@
##             next     #155   +/-   ##
=======================================
  Coverage   88.79%   88.79%           
=======================================
  Files          23       23           
  Lines        1392     1392           
=======================================
  Hits         1236     1236           
  Misses        156      156           

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[peterfpeterson]

The channel reordering is a very good change. I'm surprised we didn't spot it earlier.