chore: Add Spanner team to members.json for 2P check (#1632)

Author: meltsufin

.github/workflows/members.json

@@ -15,5 +15,11 @@
 {"login":"JoeWang1127"},
 {"login":"kmaydeo"},
 {"login":"lsirac"},
-{"login":"aeitzman"}
+{"login":"aeitzman"},
+{"login":"sakthivelmanii"},
+{"login":"rahul2393"},
+{"login":"surbhigarg92"},
+{"login":"alkatrivedi"},
+{"login":"olavloite"},
+{"login":"harshachinta"}
 ]