feat(helm): update chart emqx to 5.3.0

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This PR contains the following updates:

Package	Update	Change
emqx	minor	5.1.4 -> 5.3.0

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--- kubernetes/apps/automation/emqx/app Kustomization: flux-system/automation-emqx HelmRelease: automation/emqx

+++ kubernetes/apps/automation/emqx/app Kustomization: flux-system/automation-emqx HelmRelease: automation/emqx

@@ -9,13 +9,13 @@

     spec:
       chart: emqx
       sourceRef:
         kind: HelmRepository
         name: emqx
         namespace: flux-system
-      version: 5.1.4
+      version: 5.3.0
   dependsOn:
   - name: local-path-provisioner
     namespace: kube-system
   install:
     createNamespace: true
     remediation: