deps(backend): update markdown-it-py requirement from ==3.0.* to >=3.0,<4.3 in /backend

[dependabot]

Updates the requirements on markdown-it-py to permit the latest version.

Release notes

Sourced from markdown-it-py's releases.

v4.2.0

What's Changed

• ✨ Add make_fence_rule() factory for configurable fence markers by @​chrisjsewell in executablebooks/markdown-it-py#394
• 🚀 RELEASE v4.2.0 by @​chrisjsewell in executablebooks/markdown-it-py#395

Full Changelog: executablebooks/markdown-it-py@v4.1.0...v4.2.0

Changelog

Sourced from markdown-it-py's changelog.

4.2.0 - 2026-05-07

• ✨ Add make_fence_rule() factory for configurable fence markers in #394

4.1.0 - 2025-05-06

• ✨ Add gfm-like2 preset with task lists, alerts, and single-tilde strikethrough core plugins in #388
• ✨ Allow plugins to register inline terminator characters in #391
• 👌 Fix quadratic complexity in fragments_join / text_join in #389, thanks to @​petricevich
• 👌 Add --stdin option to CLI for reading Markdown from standard input in #379, thanks to @​mcepl
• 🔧 Add typing to Scanner in #382, thanks to @​Alunderin

Full Changelog: executablebooks/markdown-it-py@v4.0.0...v4.1.0

4.0.0 - 2024-08-10

This primarily drops support for Python 3.9, adds support for Python 3.13, and updates the parser to comply with Commonmark 0.31.2 and Markdown-It v14.1.0.

• ⬆️ Drop support for Python 3.9 in #360
• ⬆️ Comply with Commonmark 0.31.2 in #362
• 👌 Improve performance of "text" inline rule in #347
• 👌 Use str.removesuffix in #348
• 👌 limit the number of autocompleted cells in a table in #364
• 👌 fix quadratic complexity in reference parser in #367
• 🐛 Fix emphasis inside raw links bugs in #320

Full Changelog: executablebooks/markdown-it-py@v3.0.0...v4.0.0

3.0.0 - 2023-06-03

⚠️ This release contains some minor breaking changes in the internal API and improvements to the parsing strictness.

Full Changelog: executablebooks/markdown-it-py@v2.2.0...v3.0.0

⬆️ UPGRADE: Drop support for Python 3.7

Also add testing for Python 3.11

⬆️ UPGRADE: Update from upstream markdown-it 12.2.0 to 13.0.0

A key change is the addition of a new Token type, text_special, which is used to represent HTML entities and backslash escaped characters. This ensures that (core) typographic transformation rules are not incorrectly applied to these texts. The final core rule is now the new text_join rule, which joins adjacent text/text_special tokens, and so no text_special tokens should be present in the final token stream. Any custom typographic rules should be inserted before text_join.

A new linkify rule has also been added to the inline chain, which will linkify full URLs (e.g. https://example.com), and fixes collision of emphasis and linkifier (so http://example.org/foo._bar_-_baz is now a single link, not emphasized). Emails and fuzzy links are not affected by this.

... (truncated)

Commits

• 36c5f54 🚀 RELEASE v4.2.0 (#395)
• 96cf077 ✨ Add make_fence_rule() factory for configurable fence markers (#394)
• 3b4ff6d 🚀 RELEASE v4.1.0 (#393)
• 8951f26 🔧 Update pre-commit hooks (#392)
• 693bb24 ✨ Add gfm-like2 preset with task lists, alerts, and single-tilde strikethro...
• df6fd36 ✨Allow plugins to register inline terminator characters (#391)
• d4ea0ca 👌 Fix quadratic complexity in fragments_join / text_join (#389)
• 8933147 🔧 Add typing to Scanner (#382)
• 2f6ae10 🔧 Add AGENTS.md and copilot-setup-steps workflow (#380)
• 49043e4 Add --stdin option to CLI for reading Markdown from standard input (#379)
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

[Isaries]

Upper-bound widening only; the lower bound and its security rationale are unchanged. Full CI green on this branch, including backend-db, which applies the migrations against a real Postgres.