fix link to forum

Author: yorugac

.github/ISSUE_TEMPLATE/config.yml

@@ -1,6 +1,5 @@
----
 blank_issues_enabled: true
 contact_links:
-  - name: k6 Community Forum
-    url: https://community.k6.io/
+  - name: Grafana Community Forum - k6-operator
+    url: https://community.grafana.com/c/grafana-k6/k6-operator/73
     about: Please ask and answer questions here.