Update python-installer to version 0.7.0 / rev 7 via SR 1083115
https://build.opensuse.org/request/show/1083115
by user dirkmueller + dimstar_suse
- build with any python3 interpreter installed in the buildenv
- Use python311 to build if sle15_python_module_pythons is defined.
- add sle15_python_module_pythons (jsc#PED-68)