Update connect-redshift-postgresql-alloydb.md

[patkearns10]

What are you changing in this pull request and why?

We have seen an uptick of redshift ssh tunnel tickets, so we would like to add this to the docs.

Checklist

• Review the Content style guide and About versioning so my content adheres to these guidelines.
• 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
• Ran link testing to update the links that point to the deleted page

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[mirnawong1]

hey @patkearns10 , let me know when you're ready to have this pr reviewed ✨

[patkearns10]

@mirnawong1 - I will let you know! We have two customer issues in process right now that might add a use-case to this!

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[matthewshaver]

Hi @patkearns10 - This PR has been in draft for a number of months. Is this something we want to update and get reviewed/published or should it be closed?

[patkearns10]

Hi @matthewshaver -- thank you so much for the reminder, I was awaiting a review from Scott, but obviously, he left!
Should be good to go.

[mirnawong1]

hey @patkearns10 ! thanks for opening this up and it looks great! approved and going to merge for you!