component/caddy: Fetch recent version

caddyserver/builds repository is obsoleted and this commit avoids fetching
it.

component/caddy/buildout.cfg

@@ -17,7 +17,7 @@ depends =
 
 [caddy]
 # revision and repository can be used to control which caddy version is used
-revision = db2741c6e0a1c06340391c5b9fa282b876a33361
+revision = 0c3d90ed21a4df1b5e75ff4d5f908fd3018f902c
 repository = github.com/mholt/caddy/caddy
 
 recipe  = plone.recipe.command