chore(deps-dev): update pymdown-extensions requirement from <13,>=12.3 to >=12.3,<14 in the docs-dependencies group - #148

Sourced from pymdown-extensions's releases.

13.1

• NEW: Snippets: Respect the Retry-After header when a URL responds with a 429. The server's requested delay is used instead of our backoff, and the snippet fails right away if it is longer than the longest we would wait ourselves (backoff_factor times max_retries).
• NEW: Snippets: Split snippet processing into steps that an extension can override (parse_snippet_target, select_snippet_lines, and process_snippet_lines) to add notation or change included content, and add get_syntax_mask to find which lines are snippet notation so they can be left alone. (#3040)
• FIX: Fix an issue where only our test environment required Python Markdown 3.10.3. Installs must require this.
• FIX: Snippets: Fix quadratic time complexity when parsing very long runs of ; or - in content, and very long snippet paths with line ranges.
• FIX: Quotes, Details (legacy), Tabbed (legacy), FancyLists, Blocks, and Snippets: Gracefully stop short of the recursion limit when content is nested too deeply, instead of raising a RecursionError. This includes content nested inside of a document structure that is already deep, such as a quote or tab inside of many nested lists. Content past the limit is no longer specially processed (Snippets skips includes past the limit, as it does for cyclic includes).

• 9f07df0 Snippets: split parse_snippets into overridable steps (#3040)
• d6c5840 Fix spelling
• 7a88c19 Better recursion protection
• d327fd5 Snippets performance improvements
• f554351 Fix various scenarios where recursion errors could happen
• a02b252 Reorder changelog
• 04ce496 Update example
• 8db006c Remove test markdown
• 87e1fa8 Arithmatex default to generic and escape not generic content
• 9243923 Rework Critic to be more performant
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