Regression in 4.4.0 escapes mkdocstrings ::: annotation which breaks mkdocs docstring import.

[alec-bike]

With the latest mdformat-mkdocs 4.4.0, mkdocstrings ::: annotations are escaped (\:::) which breaks the mkdocs docstring import. This does not happen with 4.3.0.

Steps to reproduce (I'm using pre-commit, so this is how I fix the version of mdformat-mkdocs).

1. Baseline -- works with 4.3.0

  - repo: https://github.com/hukkin/mdformat
    rev: 0.7.22
    hooks:
      - id: mdformat
        args: [--check]
        additional_dependencies:
          - mdformat-footnote
          - mdformat-mkdocs==4.3.0

mdformat.................................................................Passed
- hook id: mdformat
- duration: 0.11s

2. Regression -- error with 4.4.0

          - mdformat-mkdocs==4.4.0

mdformat.................................................................Failed
- hook id: mdformat
- duration: 0.11s
- exit code: 1

Error: File "/Users/.../some_file.md" is not formatted.

After running mdformat, the diff on some_file.md is:

::: my_lib.core
\::: my_lib.core

[KyleKing]

You're right, thanks for reporting!

I've released v4.4.1 as a patch, which should resolve the issue. Let me know if there are any edge cases I missed