`MDAnalysis` `select_atoms` function only accepts `water` in versions `2.9` and above

[harryswift01]

Currently within MDAnalysis there is a function select_atoms that will select certain atoms from the MDAnalysis universe, as of v.2.9 a new feature was introduced which allowed users to use water as a keyword within the select_atoms functions. In the current setup of CodeEntropy within the pyproject.toml we allow versions: 2.7, 2.8 and 2.9 but with the new waterEntropy #104 integration using the keyword water within the select_atoms will cause erorrs for users who do not use MDAnalysis version 2.9 or above. I propose we enforce the use of MDAnalysis of version 2.9 and above to avoid any conflicts and messy workarounds within CodeEntropy

[jimboid]

Agree, functional changes introducing breaking changes is a good reason to drop old dependency versions.