Update snowflake-setup.md

[patkearns10]

What are you changing in this pull request and why?

https://dbt-labs.slack.com/archives/C04KKUHLT32/p1702917286747549
https://github.com/dbt-labs/dbt-cloud/pull/9675
Passphrase should be optional and are not required in the frontend (or in profiles since dbt 0.16.0), but we were requiring them when generating profiles. Updating the docs to say only provide when necessry.

Checklist

• Review the Content style guide so my content adheres to these guidelines.
• For docs versioning, review how to version a whole page and version a block of content.
• Add a checklist item for anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."

Adding new pages (delete if not applicable):

• Add page to website/sidebars.js
• Provide a unique filename for the new page

Removing or renaming existing pages (delete if not applicable):

• Remove page from website/sidebars.js
• Add an entry website/static/_redirects
• Run link testing locally with npm run build to update the links that point to the deleted page

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Name	Status	Preview	Comments	Updated (UTC)
docs-getdbt-com	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 22, 2023 4:51pm

[mirnawong1]

hey @patkearns10 some small tweaks in terms of language. also do you think the following example in the cloud doc needs updating so 'encrypted' is removed since 0.16.0 is a deprecated/unsupported version?

-----BEGIN ENCRYPTED PRIVATE KEY-----
< encrypted private key contents here - line 1 >
< encrypted private key contents here - line 2 >
< ... >
-----END ENCRYPTED PRIVATE KEY-----

[mirnawong1]

hey @patkearns10 let me know if you have any questions or thoughts 🙏

[patkearns10]

hey @patkearns10 some small tweaks in terms of language. also do you think the following example in the cloud doc needs updating so 'encrypted' is removed since 0.16.0 is a deprecated/unsupported version?

-----BEGIN ENCRYPTED PRIVATE KEY-----
< encrypted private key contents here - line 1 >
< encrypted private key contents here - line 2 >
< ... >
-----END ENCRYPTED PRIVATE KEY-----

I think we should keep this example because customers might still choose to use an encrypted private key, so those comments would still be required

[matthewshaver]

Thank you @patkearns10