Bicep deploy fails: AVM AKS module 0.9.0 uses a retired API version

`infra/bicep/kubernetes.bicep` line 15 pins:

```bicep
module managedCluster 'br/public:avm/res/container-service/managed-cluster:0.9.0' = {
```

That version uses AKS API `2024-09-02-preview`, which Azure [retired on July 1, 2026](https://learn.microsoft.com/azure/aks/concepts-preview-api-life-cycle). So `azd up` now fails:

```
NoRegisteredProviderFound: No registered resource provider found for location 'westus3'
and API version '2024-09-02-preview' for type 'managedClusters'.
```

It names a region, but it's not region-specific, I tried using `westus3`, `eastus2`, and `swedencentral`.

**Fix:** bump the module to `0.14.0`, which uses the GA API `2025-10-01`. (`0.11.1` also works but is using another preview that'll expire someday.)

Open infra/bicep/kubernetes.bicep and inspect the module reference on line 15. Run azd up after updating the AVM AKS module version; done means deployment succeeds without the retired 2024-09-02-preview API error.

Written by the indexing model from the issue text.