Add label to track issues that will be fixed by OIDC

.github/labels.yml

@@ -226,6 +226,9 @@
 - name: "Z-Fixed by Element Call"
   description: "Issues which can be closed when we move to Element Call"
   color: "ededed"
+- name: "Z-Fixed-By-OIDC"
+  description: "Issues which can be closed when we move to OIDC"
+  color: "ededed"
 - name: "Z-Flaky-Test"
   description: "A test is raising false alarms"
   color: "ededed"