Ruby version 2.4.3 is no longer supported

[DariusPirvulescu]

Hi, this theme looks awesome!

This ruby version is past its end of life and I had some trouble running it locally.
I didn't have this ruby version installed, so I ran rbenv install 2.4.3, but it couldn't install and got some errors:

Installing ruby-2.4.3...

WARNING: ruby-2.4.3 is past its end of life and is now unsupported.
It no longer receives bug fixes or critical security updates.

[...]
BUILD FAILED (macOS 13.5.2 using ruby-build 20230608)

Jekyll's guide also suggests using 2.5.0 or higher - https://jekyllrb.com/docs/

I tried running it with version 2.7.3 and it was working fine.
What would be the best action here?
Do we still need the .ruby-version file? I saw some suggestions about removing the file - #57