Pin testing dependencies

[cquinn540]

Contributor checklist

• This pull request is on a separate branch and not the main branch
• I have run the tests for the backend and frontend depending on what's needed for my changes as described in the testing section of the contributing guide

---

Description

Pin testing dependencies. If they aren't pinned updates to yarn.lock will happen in random PRs which makes it harder to track dependency changes.

Related issue

• Pin versions of testing dependencies #1032

[github-actions]

Thank you for the pull request!

The activist team will do our best to address your contribution as soon as we can. The following is a checklist for maintainers to make sure this process goes as well as possible. Feel free to address the points below yourself in further commits if you realize that actions are needed :)

If you're not already a member of our public Matrix community, please consider joining! We'd suggest using Element as your Matrix client, and definitely join the General and Development rooms once you're in. Also consider joining our bi-weekly Saturday dev syncs. It'd be great to have you!

Maintainer checklist

• The TypeScript and formatting workflows within the PR checks do not indicate new errors in the files changed

• The Playwright end to end and Zap penetration tests have been ran and are passing (if necessary)

• The changelog has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)

[netlify]

✅ Deploy Preview for activist-org ready!

Name	Link
🔨 Latest commit	ed86d7e
🔍 Latest deploy log	https://app.netlify.com/sites/activist-org/deploys/674dcd3494f8460008547ff4
😎 Deploy Preview	https://deploy-preview-1033--activist-org.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[andrewtavis]

Thanks for diagnosing the issue here and getting a fix so quickly, @cquinn540! 🚀