Multiphonon dependency upgrade

[mpatrou]

Short description of the changes:

The code includes changes related to upgrading the package dependencies, e.g. Mantid and avoid pinning (==) to specific versions.

Long description of the changes:

More specifically, it includes:

• pyproject requirements updates
• environment updates, including using the neutrons histogram dev.
• github actions simplified with the recent tools available

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

Test with histogram and multiphonon tests in the new environment

References

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.03%. Comparing base (36e97d0) to head (08917dd).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## next #158 +/- ## ========================================== + Coverage 88.79% 89.03% +0.23% ========================================== Files 23 23 Lines 1392 1395 +3 ========================================== + Hits 1236 1242 +6 + Misses 156 153 -3 ```

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[KyleQianliMa]

Tested in both environment and all tests in both histogram and multiphonon passes