fix(blink): use .get method to access presets (#6183)

## Description

Latest version of blink.cmp renamed the keymap.presets table which
breaks LazyVim's access to presets. This fixes it by using the
`presets.get()` method instead, which internally resolves to the correct
table and looks like the right API.

## Related Issue(s)

N/A

## Screenshots

N/A

## Checklist

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

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

@@ -109,7 +109,7 @@ return {
       if not opts.keymap["<Tab>"] then
         if opts.keymap.preset == "super-tab" then -- super-tab
           opts.keymap["<Tab>"] = {
-            require("blink.cmp.keymap.presets")["super-tab"]["<Tab>"][1],
+            require("blink.cmp.keymap.presets").get("super-tab")["<Tab>"][1],
             LazyVim.cmp.map({ "snippet_forward", "ai_accept" }),
             "fallback",
           }