fix(docs): Remove support reference from security docs

[dwmcallister]

Proposed changes

Per F5 Security advice, changing templated SECURITY file to remove Support reference.

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• I have updated any relevant documentation (README.md and/or CHANGELOG.md).

[github-actions]

✅ All required contributors have signed the F5 CLA for this PR. Thank you!
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[dwmcallister]

I have hereby read the F5 CLA and agree to its terms