Merge pull request #871 from fluxcd/label-1.1

Add backport:release/v1.1.x label

Author: matheuscscp

.github/labels.yaml

@@ -10,3 +10,6 @@
 - name: backport:release/v1.0.x
   description: To be backported to release/v1.0.x
   color: '#ffd700'
+- name: backport:release/v1.1.x
+  description: To be backported to release/v1.1.x
+  color: '#ffd700'