FEATURE: Needs to be adapted to Neovim 0.11

[Zeioth]

Did you check the docs?

• I have read all the docs.

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

We are using some functions that are deprecated on nvim 0.11, causing a warning when the user open neotree.

Describe the solution you'd like.

Replace the deprecated functions by the new ones.

Describe alternatives you've considered.

No response

Additional Context

More or less high prio, as more people are starting to use nvim 0.11

[Zeioth]

Lines that need to be updated.