Update shiningpanda.

The old version was installing setuptools 3.0..  Update it to install a more recent version of pip and setuptools.

playbooks/roles/jenkins_master/defaults/main.yml

@@ -72,7 +72,7 @@ jenkins_plugins:
     - { name: "ssh-agent", version: "1.5" }
     - { name: "ssh-credentials", version: "1.11" }
     - { name: "ssh-slaves", version: "1.9" }
-    - { name: "shiningpanda", version: "0.21" }
+    - { name: "shiningpanda", version: "0.23" }
     - { name: "tmpcleaner", version: "1.1" }
     - { name: "token-macro", version: "1.10" }
     - { name: "timestamper", version: "1.5.15" }