feat(changelog): add entry for new Claude 3.5 Sonnet and Haiku models in Cody

[aramaraju]

Before you merge this PR, please review the following:

Blog post

• [x ] Checked title case (This is correct. This Is Not Correct)
• [x ] Updated publishDate
• [ ] Updated authors
• [ ] Updated and checked slug
• [ ] Proofread for spelling and grammar errors
• [ ] Checked for consistent tone and voice throughout via Grammarly
• [ ] Ensured all links are working correctly
• [ ] Added relevant tags and categories
• [ ] Optimized meta description
• [ ] Included a new hero and social/OG image
• [ ] Uploaded images to Google Storage
• [ ] Formatted text for readability (headings, bullet points, etc.)
• [ ] Added image alt text
• [ ] Ran Markdown linter

Other

• [x ] This is not a blog post (I used Alex's icon because of existing assets

[netlify[bot]]

✅ Deploy Preview for sourcegraph ready!

Name	Link
🔨 Latest commit	ba5ef2e106b38535fe684751e3925d72689319b5
🔍 Latest deploy log	https://app.netlify.com/sites/sourcegraph/deploys/67327f2adfa90a0009f86ed9
😎 Deploy Preview	https://deploy-preview-7413--sourcegraph.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.

[aramaraju]

@iskyOS Minor update to fix this UI clutter: