doc: remove stale bug bounty references in SECURITY.md - #66077

Review requested:

• @nodejs/tsc

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Thanks for the review process info — happy to make any adjustments if needed!

I think we can keep those there for now... ;).

@ammar3040

I would suggest to close this PR, since it was effectively rejected by #66077 (comment)

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The last push does not fix the outstanding issues.