fix: escape characters in make_entry

[AvarianKnight]

Description

• this applies the same fix in fix: fix reverse range in character class error #2345 to make_entry

Fixes #2675

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

This was tested on the reproduction case provided in #2675

1. mkdir '[will-fail]'
2. cd '[will-fail]'
3. nvim inside of the directory
4. lua require('telescope.builtin').find_files()
5. make_entry.gen_from_file no longer fails

Configuration:

• Neovim version (nvim --version): NVIM v0.10.0-dev-856+ge928161bd
• Operating system and version: WSL Fedora 38

Checklist:

• My code follows the style guidelines of this project (stylua)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (lua annotations)

[AvarianKnight]

Closing this as there are quite a few other areas where this is broken and I'm not entirely sure how to fix them. The issue will contain some more details.