MiniJinja does not support \x00 escape sequence

## Description

MiniJinja does not support `'\0'`, `'\x42'`, '\xab' etc. as escape sequence.

## Reproduction steps

1. '{{ ["\x00"] }}' etc.

Additional helpful information:

- Version of minijinja: 2.10.2
- Version of rustc: 1.87.0

## What did you expect

I expected this to be a null character just like in Jinja2.


