Container Instance Deploy Samples are out of Date

[quickstarts/microsoft.containerinstance/aci-vnet](https://github.com/Azure/azure-quickstart-templates/tree/master/quickstarts/microsoft.containerinstance/aci-vnet)

### Issue Details
1. The Template is using version API Version 2019-12-01 which is not the latest
2. There is no longer need to define network profile in the new version

old definition :
```
networkProfile: {
id: networkProfile.id
}
```

new definition :

```
subnetIds : [
{
name : ''name",
id : "subnetResourceID"
}
]
```

reference : https://learn.microsoft.com/en-us/azure/templates/microsoft.containerinstance/containergroups?pivots=deployment-language-arm-template

Open quickstarts/microsoft.containerinstance/aci-vnet and compare its container group definition with the linked Microsoft.ContainerInstance reference. Update the API version and replace the networkProfile definition with the documented subnetIds structure; done means the sample matches the current Container Instance template schema.

Written by the indexing model from the issue text.