Drop fedora-latest test job

OpenDev is dropping fedora test nodes. That means bindep cannot continue
to run test jobs atop fedora-latest. Note that fedora-latest isn't
working anyway due to upstream removing package mirrors for fedora-36.

Longer term a good improvement to bindep may be to move the platform
testing into containers then we can run a single functional job that
spawns a container for every platform we want to test and get coverage
that way. Until then our unittests that fake in /etc/os-release content
should be sufficient coverage for fedora.

Change-Id: I0513fe13fe55b34667012efe88752f0a1f7c1037

.zuul.yaml

@@ -20,11 +20,6 @@
     parent: bindep-base
     nodeset: centos-8-stream
 
-- job:
-    name: bindep-fedora-latest
-    parent: bindep-base
-    nodeset: fedora-latest
-
 - job:
     name: bindep-opensuse-15
     parent: bindep-base
@@ -54,7 +49,6 @@
       jobs:
         - bindep-centos-7
         - bindep-centos-8-stream
-        - bindep-fedora-latest
         - bindep-opensuse-15
         - bindep-ubuntu-xenial
         - bindep-ubuntu-bionic
@@ -73,7 +67,6 @@
       jobs:
         - bindep-centos-7
         - bindep-centos-8-stream
-        - bindep-fedora-latest
         - bindep-opensuse-15
         - bindep-ubuntu-xenial
         - bindep-ubuntu-bionic