tools: Enable Python bridge on Fedora 38

Switch TestClient to a "skip" instead of an "only" list, which is more
robust. This also enables the test on arch, which runs the Python bridge
now.

test/verify/check-client

@@ -20,8 +20,8 @@
 import testlib
 
 
-# Run this on more OSes as we roll out the pybridge
-@testlib.onlyImage("needs pybridge", "debian-testing", "ubuntu-stable")
+@testlib.skipImage("needs pybridge", "debian-stable", "ubuntu-2204", "fedora-37", "fedora-coreos",
+                   "rhel-8*", "centos-8*", "rhel-9*", "centos-9*", "rhel4edge")
 class TestClient(testlib.MachineCase):
 
     provision = {

tools/cockpit.spec

@@ -53,8 +53,7 @@ Version:        0
 Release:        1%{?dist}
 Source0:        https://github.com/cockpit-project/cockpit/releases/download/%{version}/cockpit-%{version}.tar.xz
 
-# Use Python bridge on non-stable versions
-%if 0%{?fedora} >= 39
+%if 0%{?fedora} >= 38
 %define cockpit_enable_python 1
 %endif