Merge pull request #8419 from BenTheElder/sig-testing-lead-email

add missing sig-testing lead email

Author: k8s-ci-robot

sigs.yaml

@@ -3198,6 +3198,7 @@ sigs:
     - github: xmcqueen
       name: Brian McQueen
       company: LinkedIn
+      email: [email protected]
     tech_leads:
     - github: BenTheElder
       name: Benjamin Elder