(issue #604) Remove dependency on python_version<3.11

[NicholasBHubbard]

This PR aims to solve issue #604.

I simply removed the dependency on python_version<'3.11' from the dependencies list. I determined that there was no need to change the minimum required version of tomli, due to tomli version 1.2.3 supporting any Python version greater or equal to 3.6. Here is a link to the pyproject.toml file for tomli version 1.2.3.

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[inknos]

Sorry for missing the point of the issue. I was tired and when I returned to it, I made a wrong evaluation.

The line "tomli>=1.2.3; python_version<'3.11'" is an environment marker that will imply that tomli would be installed if pyhton version is below 3.11. tomli is in python since 3.11