Warning: `vim.validate` is deprecated

[h3xOo]

I have following stack when running checkhealth:

- ⚠️ WARNING vim.validate is deprecated. Feature will be removed in Nvim 1.0
  - ADVICE:
    - use vim.validate(name, value, validator, optional_or_msg) instead.
    - stack traceback:
        $HOME/.local/share/nvim/lazy/cmp-buffer/lua/cmp_buffer/source.lua:34
        $HOME/.local/share/nvim/lazy/cmp-buffer/lua/cmp_buffer/source.lua:45
        $HOME/.local/share/nvim/lazy/nvim-cmp/lua/cmp/source.lua:239
        $HOME/.local/share/nvim/lazy/nvim-cmp/lua/cmp/source.lua:283
        $HOME/.local/share/nvim/lazy/nvim-cmp/lua/cmp/core.lua:308
        $HOME/.local/share/nvim/lazy/nvim-cmp/lua/cmp/core.lua:178
        $HOME/.local/share/nvim/lazy/nvim-cmp/lua/cmp/core.lua:238
        $HOME/.local/share/nvim/lazy/nvim-cmp/lua/cmp/core.lua:170
        $HOME/.local/share/nvim/lazy/nvim-cmp/lua/cmp/init.lua:372
        $HOME/.local/share/nvim/lazy/nvim-cmp/lua/cmp/utils/autocmd.lua:53
        $HOME/.local/share/nvim/lazy/nvim-cmp/lua/cmp/utils/autocmd.lua:14