chore(deps): update dependency pymdown-extensions to v10.15

[slack-oss-bot]

This PR contains the following updates:

Package	Update	Change
pymdown-extensions	minor	==10.14.3 -> ==10.15

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Release Notes

facelessuser/pymdown-extensions (pymdown-extensions)

v10.15

Compare Source

10.15.0

• NEW: SuperFences: Add relaxed_headers option which can tolerate bad content in the fenced code header. When
  enabled, code blocks with bad content in the header will likely still convert into code blocks, often respecting
  the specified language.
• NEW: Add type hints to the Blocks interface and a few additional files.
• FIX: Blocks: Fix some corner cases of nested blocks with lists.
• FIX: Tab and Tabbed: Fix a case where tabs could fail if combine_header_slug was enabled and there was no
  header.

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