chore: fix security issues (PROVCON-4790)

[darekplawecki]

1. fast-xml-parser
   • this is low-risk
   • no breaking API changes are expected
2. lodash
   • not sure, but it's no major upgrade, so should be okay
3. yaml
   • this is low-risk
   • 2.8.x includes mostly bug fixes around parsing edge cases and improved CST handling — nothing that affects standard parse/stringify usage
4. immer
   • if target environments are modern (Chrome/Firefox/Safari/Edge, Node 12+), the upgrade is low-risk

[netlify]

✅ Deploy Preview for stoplight-elements ready!

Name	Link
🔨 Latest commit	6b0da8e
🔍 Latest deploy log	https://app.netlify.com/projects/stoplight-elements/deploys/6a0d7bb756e4be00087b2517
😎 Deploy Preview	https://deploy-preview-2922--stoplight-elements.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 project configuration.

[netlify]

✅ Deploy Preview for stoplight-elements-demo ready!

Name	Link
🔨 Latest commit	6b0da8e
🔍 Latest deploy log	https://app.netlify.com/projects/stoplight-elements-demo/deploys/6a0d7bb76f7cc100089422f7
😎 Deploy Preview	https://deploy-preview-2922--stoplight-elements-demo.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 project configuration.