Merge pull request #1231 from fluxcd/update-labels

Add 1.3.x release label

Author: matheuscscp

.github/labels.yaml

@@ -22,3 +22,6 @@
 - name: backport:release/v1.2.x
   description: To be backported to release/v1.2.x
   color: '#ffd700'
+- name: backport:release/v1.3.x
+  description: To be backported to release/v1.3.x
+  color: '#ffd700'