apps/meet/calcom: fix port quoting

https://github.com/fluxcd/kustomize-controller/blob/main/docs/spec/v1/kustomizations.md#post-build-substitution-of-numbers-and-booleans

apps/meet/calcom-kustomization.yaml

@@ -21,6 +21,8 @@ spec:
     - name: nginx
     - name: single-sign-on
   postBuild:
+    substitute:
+      quote: '"'
     substituteFrom:
       - kind: Secret
         name: stackspin-cluster-variables

apps/meet/calcom/calcom-keys.yaml

@@ -11,7 +11,7 @@ stringData:
   EMAIL_FROM: "${outgoing_mail_from_address}"
   EMAIL_FROM_NAME: "${org_name}"
   EMAIL_SERVER_HOST: "${outgoing_mail_smtp_host}"
-  EMAIL_SERVER_PORT: "${outgoing_mail_smtp_port}"
+  EMAIL_SERVER_PORT: ${quote}${outgoing_mail_smtp_port}${quote}
   EMAIL_SERVER_USER: "${outgoing_mail_smtp_user}"
   EMAIL_SERVER_PASSWORD: "${outgoing_mail_smtp_password}"
   # email_enabled: "${outgoing_mail_enabled}"