use %python3_sitearch in filter_provides_in, otherwise the package fails to build

python-cups.spec

@@ -1,12 +1,12 @@
 %{?filter_setup:
-%filter_provides_in %{python_sitearch}/.*\.so$ 
+%filter_provides_in %{python3_sitearch}/.*\.so$
 %filter_setup
 }
 
 Summary:       Python bindings for CUPS
 Name:          python-cups
 Version:       2.0.1
-Release:       3%{?dist}
+Release:       4%{?dist}
 # older URL, but still with useful information about pycups
 #URL:           http://cyberelk.net/tim/software/pycups/
 URL:           https://github.com/OpenPrinting/pycups/
@@ -67,6 +67,9 @@ export PYTHONPATH=%{buildroot}%{python3_sitearch}
 %doc examples html
 
 %changelog
+* Wed Jul 29 2020 Zdenek Dohnal <zdohnal@redhat.com> - 2.0.1-4
+- use %%python3_sitearch in filter_provides_in, otherwise the package fails to build
+
 * Wed Jul 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 2.0.1-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild