[LyX/master] Python runtime detection requirement upgraded to 3.8

[Pavel Sanda]

On Mon, Jun 10, 2024 at 09:04:42AM +0000, José Matos wrote:
> commit 1c458dc1212865e9c9e2fd0207f15a72f4988e63
> Author: José Matos <jamatos at lyx.org>
> Date:   Mon Jun 10 10:04:26 2024 +0100
> 
>     Python runtime detection requirement upgraded to 3.8
>     
>     Remove -tt option that is a no-op in Python 3.
>     
>     Remove search for Python 2

Hi Jose,

bumping p3 version requirements and dropping p2 should go into RELEASE-NOTES
and specific version should be fixed in INSTALL/README...

Pavel