Fix Build Docs workflow: update pymdown-extensions to >=9.0

[Copilot]

The Build Docs workflow fails with KeyError: 'anchor_linenums' because pymdown-extensions==8.2 (pinned in 2021) doesn't support this option. The option was added in version 9.0.

Changes

Updated docs/requirements.txt:

• pymdown-extensions>=9.0 (was ==8.2)
• mkdocs-material>=8.0.0 (was ==7.2.3)
• jinja2>=3.0.3 (was ==3.0.3)

The mkdocs.yml configuration remains unchanged - it was already correct:

markdown_extensions:
  - pymdownx.highlight:
      anchor_linenums: true

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• facelessuser.github.io
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Fix the latest "Build Docs" workflow in Github Actions

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