Label sync for release/v1.4.x

Signed-off-by: Sunny <[email protected]>

Author: darkowlzz

.github/labels.yaml

@@ -29,3 +29,6 @@
 - name: backport:release/v1.3.x
   description: To be backported to release/v1.3.x
   color: '#ffd700'
+- name: backport:release/v1.4.x
+  description: To be backported to release/v1.4.x
+  color: '#ffd700'