fix(catppuccin): follow renamed integration (#6354)

## Description

[This
commit](30fa4d122d)
renamed a Catppuccin integration; this PR follows the rename.

## Checklist

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

lua/lazyvim/plugins/colorscheme.lua

@@ -58,7 +58,7 @@ return {
         optional = true,
         opts = function(_, opts)
           if (vim.g.colors_name or ""):find("catppuccin") then
-            opts.highlights = require("catppuccin.groups.integrations.bufferline").get()
+            opts.highlights = require("catppuccin.groups.integrations.bufferline").get_theme()
           end
         end,
       },