fix(blink): update config for latest changes (#4953)

## Description

Update the blink.cmp config for the latest changes.

Mainly fixing the experimental `auto_brackets` support (moved under the
`completion` key). The other changes are either the same as the
defaults, or commented out - they were simply updated to reflect the new
config format.

## Checklist

- [x] I've read the
[CONTRIBUTING](https://github.com/LazyVim/LazyVim/blob/main/CONTRIBUTING.md)
guidelines.

lua/lazyvim/plugins/extras/coding/blink.lua

@@ -33,16 +33,22 @@ return {
     ---@module 'blink.cmp'
     ---@type blink.cmp.Config
     opts = {
-      highlight = {
+      appearance = {
         -- sets the fallback highlight groups to nvim-cmp's highlight groups
         -- useful for when your theme doesn't support blink.cmp
         -- will be removed in a future release, assuming themes add support
         use_nvim_cmp_as_default = false,
+        -- set to 'mono' for 'Nerd Font Mono' or 'normal' for 'Nerd Font'
+        -- adjusts spacing to ensure icons are aligned
+        nerd_font_variant = "mono",
       },
-      -- set to 'mono' for 'Nerd Font Mono' or 'normal' for 'Nerd Font'
-      -- adjusts spacing to ensure icons are aligned
-      nerd_font_variant = "mono",
       completion = {
+        accept = {
+          -- experimental auto-brackets support
+          auto_brackets = {
+            enabled = true,
+          },
+        },
         menu = {
           draw = {
             treesitter = true,
@@ -57,11 +63,9 @@ return {
         },
       },
 
-      -- experimental auto-brackets support
-      accept = { auto_brackets = { enabled = true } },
-
       -- experimental signature help support
-      -- trigger = { signature_help = { enabled = true } }
+      -- signature = { enabled = true },
+
       sources = {
         -- adding any nvim-cmp sources here will enable them
         -- with blink.compat