Bug 1750851 - set contact for socketprocess variants. r=releng-reviewers,hneiva

Differential Revision: https://phabricator.services.mozilla.com/D136273

taskcluster/ci/test/variants.yml

@@ -118,6 +118,7 @@ fission-webgl-ipc:
 
 socketprocess:
     description: "{description} with socket process enabled"
+    contact: kershaw
     suffix: "spi"
     merge:
         mozharness:
@@ -127,6 +128,7 @@ socketprocess:
 
 socketprocess_networking:
     description: "{description} with networking on socket process enabled"
+    contact: kershaw
     suffix: "spi-nw"
     merge:
         mozharness: