feat: updates backend to listen on both IPv4 and IPv6 addresses (#6992)

(cherry picked from commit d15956ede20307bbc500e8f589984c3c87294987)
diff --git a/backend/server/api/api.go b/backend/server/api/api.go
index a4894cf..e04e9e6 100644
--- a/backend/server/api/api.go
+++ b/backend/server/api/api.go
@@ -166,7 +166,7 @@
 	}
 
 	// Start the server
-	err = router.Run(fmt.Sprintf("0.0.0.0:%d", portNum))
+	err = router.Run(fmt.Sprintf(":%d", portNum))
 	if err != nil {
 		panic(err)
 	}