cargo2rpm: build for Python 3.11 on epel9

- Conditionally set %python3_pkgversion
- Use pytest directly in place of tox. tox is not packaged for
  python3.11.

cargo2rpm.spec

@@ -1,4 +1,7 @@
 %bcond_without check
+%if %{defined el9}
+%global python3_pkgversion 3.11
+%endif
 
 Name:           cargo2rpm
 Version:        0.1.2
@@ -11,7 +14,10 @@ Source:         %{url}/archive/%{version}/cargo2rpm-%{version}.tar.gz
 
 BuildArch:      noarch
 
-BuildRequires:  python3-devel
+BuildRequires:  python%{python3_pkgversion}-devel
+%if %{with check}
+BuildRequires:  %{py3_dist pytest}
+%endif
 
 Requires:       cargo
 
@@ -24,7 +30,7 @@ and a Python API (which rust2rpm is built upon).
 %autosetup -p1
 
 %generate_buildrequires
-%pyproject_buildrequires %{?with_check:-t}
+%pyproject_buildrequires
 
 %build
 %pyproject_wheel
@@ -36,7 +42,7 @@ and a Python API (which rust2rpm is built upon).
 %check
 %pyproject_check_import
 %if %{with check}
-%tox
+%pytest
 %endif
 
 %files -f %{pyproject_files}