chore(deps): update sass to 1.98.0 (#17096)

## Summary

Updates sass from 1.69.5 to 1.98.0.

## Why

- Pulls in patched `immutable` dependency (fixes CVE-2026-29063 -
prototype pollution)
- Bug fixes for watch mode and browser environments

## Changes in sass 1.98.0

- Gracefully handle dependency loops in `--watch` mode
- Fix crash when manually constructing `SassCalculation` for 'calc'
- Properly emit deprecation warnings in browser environments
- Emit colored warnings on browser console

## Testing

- [x] `pnpm install` succeeds
- [ ] CI will validate full build

## Related

Part of security dependency cleanup effort.

Helps address:
- https://github.com/getsentry/sentry-docs/security/dependabot/266

Co-authored-by: Shannon Anahata <shannonanahata@gmail.com>

Author: sfanahata

package.json

@@ -114,7 +114,7 @@
     "remark-rehype": "^11.1.2",
     "remark-stringify": "^11.0.0",
     "rss": "^1.2.2",
-    "sass": "^1.69.5",
+    "sass": "^1.98.0",
     "search-insights": "^2.17.2",
     "server-only": "^0.0.1",
     "sharp": "^0.33.4",