gcc13 from home:smarty12:gcc project

Sty agraw n unessmres nnek/m

For openSUSE Leap 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:smarty12:gcc/openSUSE_Leap_15.4/home:smarty12:gcc.repo
zypper refresh
zypper install gcc13
For openSUSE Leap 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:smarty12:gcc/openSUSE_Leap_15.3/home:smarty12:gcc.repo
zypper refresh
zypper install gcc13