Bump the tailwindcss group across 1 directory with 2 updates (#1843)

Bumps the tailwindcss group with 2 updates in the /src/Elastic.Documentation.Site directory: [tailwindcss](https://github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/tailwindcss) and [@tailwindcss/postcss](https://github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/@tailwindcss-postcss).


Updates `tailwindcss` from 4.1.12 to 4.1.13
- [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/v4.1.13/packages/tailwindcss)

Updates `@tailwindcss/postcss` from 4.1.12 to 4.1.13
- [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/v4.1.13/packages/@tailwindcss-postcss)

---
updated-dependencies:
- dependency-name: tailwindcss
  dependency-version: 4.1.13
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: tailwindcss
- dependency-name: "@tailwindcss/postcss"
  dependency-version: 4.1.13
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: tailwindcss
...

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

Author: dependabot[bot]

src/Elastic.Documentation.Site/package-lock.json

@@ -40,7 +40,7 @@
     "@babel/preset-typescript": "7.27.1",
     "@eslint/js": "9.35.0",
     "@parcel/reporter-bundle-analyzer": "2.15.4",
-    "@tailwindcss/postcss": "4.1.12",
+    "@tailwindcss/postcss": "4.1.13",
     "@testing-library/jest-dom": "6.8.0",
     "@testing-library/react": "16.3.0",
     "@testing-library/user-event": "14.6.1",
@@ -83,7 +83,7 @@
     "htmx-ext-preload": "2.1.1",
     "htmx.org": "2.0.6",
     "select-dom": "9.4.0",
-    "tailwindcss": "4.1.12",
+    "tailwindcss": "4.1.13",
     "tippy.js": "6.3.7",
     "ua-parser-js": "2.0.4",
     "uuid": "11.1.0",