docs: Update cpp.md to indicate GDB version requirements (#40027)

Release Notes:

- N/A

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Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>
Co-authored-by: Marshall Bowers <git@maxdeviant.com>
a660a39ae8Seeni committed on 10/17/2025, 9:02:53 PM· committed by GitHubparent6028545
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