Update Chart.yaml and changelog for 0.26.3 release

Author: cf-ci-bot-v2

charts/gitops-runtime/Chart.yaml

@@ -15,6 +15,8 @@ annotations:
   artifacthub.io/containsSecurityUpdates: "true"
   artifacthub.io/alternativeName: "codefresh-gitops-runtime"
   artifacthub.io/changes: |-
+    - kind: changed
+      description: updated nats-server-config-reloader (#1004)
     - kind: changed
       description: 'fix: update app-proxy image tags to latest version 5f0a3d5 (#1001)'
 dependencies: