Virtualfish

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Resolve compatibility issue with Python 3.12

Contributed by [Branch Vincent](https://github.com/branchvincent) via [PR #244](https://github.com/justinmayer/virtualfish/pull/244/)

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Fix `vf upgrade` error related to `sed`

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Improve resiliency of `check_fish_version()` function to invisible characters such as tabs.

Contributed by [Justin Mayer](https://github.com/justinmayer) via [PR #241](https://github.com/justinmayer/virtualfish/pull/241/)

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* Raise minimum Python version to 3.7
* Remove upper bounds on dependency versions

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* Use tool versions file to colorize `ls --details` ([212](https://github.com/justinmayer/virtualfish/pull/212) by [Justin Mayer](https://justinmayer.com/))
* _[`auto_activation`]_: Fix bug that auto-deactivated environments incorrectly ([210](https://github.com/justinmayer/virtualfish/pull/210) by [cecep2](https://github.com/cecep2))

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* Preserve `.project` files when re-building environments ([206](https://github.com/justinmayer/virtualfish/pull/206))
* Improve Pyenv version detection ([208](https://github.com/justinmayer/virtualfish/pull/208))
* _[`auto_activation`]_: Auto-deactivate environments in `$PROJECT_HOME` without requiring `.project` files ([209](https://github.com/justinmayer/virtualfish/pull/209))
* Improve installation instructions ([207](https://github.com/justinmayer/virtualfish/pull/207))

Many thanks to [cecep2](https://github.com/cecep2) for all of the above improvements!