Docs: Add Bun package manager example to the 'Data Security' guide

[obendev]

What is the documentation issue?

The docs/01-app/02-guides/data-security.mdx file is missing a Bun installation example for server-only.

Is there any context that might help us understand?

This appears to be an oversight, as Bun examples are present elsewhere in the documentation. The fix is to add a bun add server-only code block to ensure consistency with the rest of the docs.

Does the docs page already exist? Please link to it.

https://nextjs.org/docs/app/guides/data-security

[github-actions]

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