Add SIG-Multicluster lead emails

As per kubernetes/steering#281

Signed-off-by: Stephen Kitt <[email protected]>

Author: skitt

sigs.yaml

@@ -2134,9 +2134,11 @@ sigs:
     - github: jeremyot
       name: Jeremy Olmsted-Thompson
       company: Google
+      email: [email protected]
     - github: skitt
       name: Stephen Kitt
       company: Red Hat
+      email: [email protected]
     emeritus_leads:
     - github: pmorie
       name: Paul Morie