Lima caCerts configuration deleted from template

### Description

Lima allows certificate trust to be provisioned through the caCerts key, but this gets deleted from colima's template when added.

caCert in Lima overrride.yaml doesn't get merged into lima.yaml either.

### Version

Colima Version: 0.5.4
Lima Version: 0.15.0
Qemu Version: 7.2.0

### Operating System

- [ ] macOS Intel <= 12 (Monterrey)
- [X] macOS Intel >= 13 (Ventura)
- [ ] macOS M1 <= 12 (Monterrey)
- [ ] macOS M1 >= 13 (Ventura)
- [ ] Linux

### Output of `colima status`

_No response_

### Reproduction Steps

1. Add a caCert key to a colima configuration file.
2. Save and load it.
3. Watch it vanish.

Alternatively,
1. Add caCert to override.yaml
2. Look for caCert in a colima VM's lima.yaml

### Expected behaviour

Colima should allow lima configurations to merge correctly.

### Additional context

_No response_