Fix pathfix usage in spec

Python 3.12 removes the pathfix utility but in Fedora it's just moved to
python3-rpm-macros.

Fixes broken build and broken CI on Rawhide.

Described in: https://fedoraproject.org/wiki/Changes/Python3.12#pathfix.py_tool_will_be_removed
Similar to: https://src.fedoraproject.org/rpms/openscap/pull-request/17#request_diff

Fixes: OpenSCAP#1997

openscap.spec

@@ -154,7 +154,7 @@ ctest -V %{?_smp_mflags}
 find $RPM_BUILD_ROOT -name '*.la' -exec rm -f {} ';'
 
 # fix python shebangs
-pathfix.py -i %{__python3} -p -n $RPM_BUILD_ROOT%{_bindir}/scap-as-rpm
+%{__python3} %{_rpmconfigdir}/redhat/pathfix.py -i %{__python3} -p -n $RPM_BUILD_ROOT%{_bindir}/scap-as-rpm
 
 %ldconfig_scriptlets