[Feature]: docs: add `vim.pack` instructions when 0.12 comes out

### Did you check the docs?

- [x] I have read all the docs

### Is your feature request related to a problem? Please describe.

nvim 0.12 has built-in `vim.pack`

### Describe the solution you'd like

`vim.pack` instructions

### Describe alternatives you've considered

n/a

### Additional context

_No response_