fixed installation process

[YassirEH]

using Fedora39, Nobara39 i couldn't install torch using python 3.12 (default), all i did was change the webui.sh to use python3.10 instead of python3 because this is only compatible with python 3.10

Description

• Fix installation process.
• simply changed line 47 python_cmd="python3" to python_cmd="python3.10".
• python3 (right now 3.12) isn't compatible.
• do not i used a custom repository to install python 3.10 on my system using
  sudo dnf config-manager --add-repo https://download.fedoraproject.org/pub/fedora/linux/testing/37/x86_64/os/Packages/
  then sudo dnf install python310
  then python3.10 -m pip install --upgrade pip
  *this fixed the issue i was having during installation on Nobara39 and in a Fedora39 in a VM.
  *hope i was of any help, cheers.

Screenshots/videos:

Checklist:

• I have read contributing wiki page
• I have performed a self-review of my own code
• My code follows the style guidelines
• My code passes tests