fix(neo-tree): remove branch, since it obstructs updating to latest version (#3871)

## What is this PR for?
`branch` was obstructing from being able to update to latest HEAD like
in other plugins. This was necessary when the initial development was
being done on this branch and `main` was used for the old stable
release, but this is not necessary any more. Also, @folke now you can
use `always_show_by_pattern`, which you might find useful to show the
git tracked hidden files like you wanted but couldn't do before.
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  why we should accept this pull request. -->

## Does this PR fix an existing issue?
No
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## Checklist

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

lua/lazyvim/plugins/editor.lua

@@ -3,7 +3,6 @@ return {
   -- file explorer
   {
     "nvim-neo-tree/neo-tree.nvim",
-    branch = "v3.x",
     cmd = "Neotree",
     keys = {
       {