[Snyk] Security upgrade express from 4.21.2 to 4.22.0

[posit-snyk-bot]

Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• extensions/positron-proxy/package.json
• extensions/positron-proxy/package-lock.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Allocation of Resources Without Limits or Throttling SNYK-JS-QS-14724253	170

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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Allocation of Resources Without Limits or Throttling

@:apps
@:help
@:viewer
@:web
@:win

[github-actions]

Thank you all for this PR! We ask that you sign our Contributor License Agreement before we accept your contribution. You can sign the CLA by posting a comment on this PR saying:

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I have read the CLA Document and I hereby sign the CLA

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1 out of 2 committers have signed the CLA.
✅ (juliasilge)[https://github.com/juliasilge]
❌ @snyk-bot
_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}

[github-actions]

E2E Tests 🚀
This PR will run tests tagged with: @:critical @:apps @:help @:viewer @:web @:win

^{readme  valid tags}

[juliasilge]

Turns out that the user here is not a GitHub App, but rather:

"author": {"login": "posit-snyk-bot", "is_bot": false}

This PR will use the CLA on main and not here (so the CLA action will still fail), but we can at least get the fix merged for next time.