workarounds: kwin build that fixes VT switch for F38 and F39

The F38 update that breaks this hasn't gone stable due to gating
and the F39 update will be pulled in once the tests are done
and it goes stable, but doing this anyway so I can re-run the
tests on the F38 plasma-workspace update and push it stable,
and rerun all the failed Rawhide tests without waiting for all
the tests on this update to finish first.

lib/utils.pm

@@ -479,8 +479,8 @@ sub setup_workaround_repo {
     my %workarounds = (
         "36" => [],
         "37" => [],
-        "38" => [],
-        "39" => [],
+        "38" => ["FEDORA-2023-f60de6c2aa"],
+        "39" => ["FEDORA-2023-5b9ff0154e"],
     );
     # then we'll download each update for our release:
     my $advortasks = $workarounds{$version};