Bump tailwindcss from 4.1.5 to 4.1.6 in /src/Elastic.Markdown (#1254)

Bumps [tailwindcss](https://github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/tailwindcss) from 4.1.5 to 4.1.6.
- [Release notes](https://github.com/tailwindlabs/tailwindcss/releases)
- [Changelog](https://github.com/tailwindlabs/tailwindcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/tailwindlabs/tailwindcss/commits/v4.1.6/packages/tailwindcss)

---
updated-dependencies:
- dependency-name: tailwindcss
  dependency-version: 4.1.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

src/Elastic.Markdown/package-lock.json

@@ -49,7 +49,7 @@
     "htmx-ext-preload": "2.1.1",
     "htmx.org": "2.0.4",
     "select-dom": "9.3.1",
-    "tailwindcss": "4.1.5",
+    "tailwindcss": "4.1.6",
     "ua-parser-js": "2.0.3"
   }
 }