Upgrade python-markdown to version 3.9

[realsdx]

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• The toolchain has been rebuilt successfully (or no changes were made to it)
• The toolchain/worker package manifests are up-to-date
• Any updated packages successfully build (or no packages were changed)
• Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• All package sources are available
• cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• LICENSE-MAP files are up-to-date (./LICENSES-AND-NOTICES/SPECS/data/licenses.json, ./LICENSES-AND-NOTICES/SPECS/LICENSES-MAP.md, ./LICENSES-AND-NOTICES/SPECS/LICENSE-EXCEPTIONS.PHOTON)
• All source files have up-to-date hashes in the *.signatures.json files
• sudo make go-tidy-all and sudo make go-test-coverage pass
• Documentation has been updated to match any changes to the build system
• Ready to merge

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Summary

What does the PR accomplish, why was it needed?

Change Log

• Change
• Change
• Change

Work Item Link: https://microsoft.visualstudio.com/OS/_workitems/edit/58553340/

Does this affect the toolchain?

NO

Test Methodology

• Pipeline build id: link

[CBL-Mariner-Bot]

✅ PR Check Passed

No critical issues detected in spec file changes.

🤖 AI Analysis Summary:

Brief Analysis:
This PR bumps python-markdown from 3.5.2 to 3.9 and adjusts the Source0 URL along with a minor fix for pyproject.toml compliance. No CVE patch references were added in this update.

Critical Issues Found:
• ERROR: No issues with CVE patch references, as none were referenced in this change.
• No CVE-related patches are missing from the package.

Recommended Actions:
• Confirm that no CVE fixes are intended for this release.
• Document any future security patches with proper Patch: CVE-YYYY-XXXXX.patch lines and matching changelog entries if applicable.
• Continue to verify the integrity of version upgrades against upstream security advisories.

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📋 For detailed analysis and recommendations, check the Azure DevOps pipeline logs.

[realsdx]

Buddy Build

[PawelWMS]

Change itself looks good to me and should be good to merge as soon as stable shiproom approves the version bump.