Require python3-setuptools

Otherwise it leads to:

>>> import pikepdf
Traceback (most recent call last):
  File "/usr/lib64/python3.10/site-packages/pikepdf/__init__.py", line
      19, in <module>
    from ._version import __version__
  File "/usr/lib64/python3.10/site-packages/pikepdf/_version.py", line
      7, in <module>
    from pkg_resources import DistributionNotFound
ModuleNotFoundError: No module named 'pkg_resources'

https://bugzilla.redhat.com/show_bug.cgi?id=2096442

python-pikepdf.spec

@@ -24,6 +24,7 @@ based on QPDF, a powerful PDF manipulation and repair library.
 
 %package -n     python3-%{srcname}
 Summary:        %{summary}
+Requires:       python%{python3_version}dist(setuptools)
 
 %description -n python3-%{srcname}
 pikepdf is a Python library for reading and writing PDF files. pikepdf is