[Deps] pin cmarkgfm until build issue resolved

[brian-dellabetta]

SUMMARY:
Cmarkgfm 2025.10.20 was released today, but the wheel build for linux is failing -- https://github.com/theacodes/cmarkgfm/actions/runs/18653185184

Pinning our version until this is resolved, as it breaks all ci/cd checks. Resolution likely in the next couple days.

TEST PLAN:
ci/cd passes on this branch

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[gemini-code-assist]

Summary of Changes

Hello @brian-dellabetta, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request aims to restore stability to the project's continuous integration and deployment pipelines by temporarily restricting the version of the cmarkgfm dependency. A recent release of cmarkgfm introduced a build failure on Linux, and pinning the dependency to an older, stable version prevents these failures, ensuring that development can proceed without interruption until the upstream issue is resolved.

Highlights

• Dependency Pinning: The cmarkgfm dependency has been temporarily pinned to a version less than 2025.10.20.
• CI/CD Stability: This change addresses a critical build issue introduced by the cmarkgfm 2025.10.20 release, which was causing all CI/CD checks to fail on Linux.

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[gemini-code-assist]

Code Review

This pull request correctly pins the cmarkgfm dependency to a version before 2025.10.20 to resolve a build failure in CI/CD. The change is straightforward and effective. I've added one suggestion to rephrase the comment as a TODO to make this temporary fix more visible and easier to track for future removal.

[fynnsu]

I like the gemini suggestion. Otherwise looks good!