⬆️ Update linkify-it-py requirement from ~=1.0 to ~=2.0 (#675)

See https://github.com/tsutsu3/linkify-it-py/blob/main/CHANGELOG.md

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Chris Sewell <chrisj_sewell@hotmail.com>

pyproject.toml

@@ -49,7 +49,7 @@ Documentation = "https://myst-parser.readthedocs.io"
 [project.optional-dependencies]
 code_style = ["pre-commit~=3.0"]
 # for use with "linkify" extension
-linkify = ["linkify-it-py~=1.0"]
+linkify = ["linkify-it-py~=2.0"]
 # Note: This is only required for internal use
 rtd = [
     "ipython",