fix: elimanate deprerated warnings

[phanen]

No description provided.

[AntoineGS]

This seems to have broken the plugin :)
https://github.com/AntoineGS/copilot.lua/actions/runs/14451766867/job/40525916887
I don't have access to the repo configs to add automated testing so I had to do it on my fork.
But they are all failing, the same happens when I run it on nvim 0.11 by checkout out the branch:

[phanen]

if fn.has("nvim-0.11") == 1 then

should be vim.fn

i am away from keyboard and i ll fix it tomorrow

[phanen]

I test on 0.10.0/0.11.0, should work well now.

[AntoineGS]

looking good :P

[AntoineGS]

I've had to revert the commit, as it was breaking the Copilot blink plugin #462
Feel free to open a new PR if you figure out how to resolve it, as support for 0.10 is still important.

[phanen]

ok i will see what i can do tomorrow

[phanen]

The revert can be reverted when giuxtaposition/blink-cmp-copilot#14 merged. (I create #464).