KIC fails to sync with Konnect when updating Certificate

[czeslavo]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

When an existing Certificate generated out of a Kubernetes Secret gets updated, KIC fails to synchronise with Konnect's Runtime Group's Admin API with the following error:

time="2023-07-18T14:35:44Z" level=warning msg="Failed pushing configuration to Konnect" error="performing update for https://us.kic.api.konghq.com/kic/api/runtime_groups/5afc1090-6bc7-4b2a-a252-14f28fe1ac57 failed: 1 errors occurred:\n\twhile processing event: {Update} certificate 1fecb0e6-0674-43cd-8d1c-b4446fc23f90 failed: HTTP status 400 (message: \"proto: (line 1:5535): unknown field \\\"snis\\\"\")\n"

It's a result of a bug in deck that was already fixed in Kong/deck#978.

Expected Behavior

KIC succeeds to update existing certificates when syncing with Konnect's Runtime Group's Admin API.

Steps To Reproduce

1. Create an `Ingress` with `tls.[].secretName` pointing to a tls `Secret`.
2. Let KIC synchronise config with Gateways and Konnect (expect no errors).
3. Modify the `Secret`'s by replacing its key and crt with another valid pair. 

This will cause KIC to fail synchronise with the following error in logs:


time="2023-07-18T14:35:44Z" level=warning msg="Failed pushing configuration to Konnect" error="performing update for https://us.kic.api.konghq.com/kic/api/runtime_groups/5afc1090-6bc7-4b2a-a252-14f28fe1ac57 failed: 1 errors occurred:\n\twhile processing event: {Update} certificate 1fecb0e6-0674-43cd-8d1c-b4446fc23f90 failed: HTTP status 400 (message: \"proto: (line 1:5535): unknown field \\\"snis\\\"\")\n"

Kong Ingress Controller version

v2.10.3

Kubernetes version

No response

Anything else?

Although Kong/deck#978 is already merged in deck, it's not released yet. We need to wait for v1.24.0 to be released.