build(deps): bump better-auth from 1.6.9 to 1.6.11 (#2294)

Bumps [better-auth](https://github.com/better-auth/better-auth/tree/HEAD/packages/better-auth) from 1.6.9 to 1.6.11.
- [Release notes](https://github.com/better-auth/better-auth/releases)
- [Changelog](https://github.com/better-auth/better-auth/blob/main/packages/better-auth/CHANGELOG.md)
- [Commits](https://github.com/better-auth/better-auth/commits/better-auth@1.6.11/packages/better-auth)

---
updated-dependencies:
- dependency-name: better-auth
  dependency-version: 1.6.11
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Andrea Sánchez Blanco <asanchezblanco@stackoverflow.com>

Author: dependabot[bot]

package-lock.json

@@ -32,7 +32,7 @@
         "@stackoverflow/stacks-icons-legacy": "*",
         "@stackoverflow/stacks-svelte": "*",
         "@stefanprobst/rehype-extract-toc": "^3.0.0",
-        "better-auth": "^1.4.7",
+        "better-auth": "^1.6.11",
         "highlight.js": "^11.11.1",
         "rehype-autolink-headings": "^7.1.0",
         "rehype-slug": "^6.0.0",