chore: SBOM link for 3.8

[lena-larionova]

Description

https://konghq.atlassian.net/browse/DOCU-4032

Link doesn't exist yet, do not merge until release day (or after).

Testing instructions

Preview link:

Checklist

• [x] Review label added
• [x] Conditional version tags added, if applicable.

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[lena-larionova]

Will reopen if this ever gets posted.