chore(web): bump the tailwind group across 1 directory with 2 updates

Bumps the tailwind group with 1 update in the /web directory: [@tailwindcss/postcss](https://github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/@tailwindcss-postcss).


Updates `@tailwindcss/postcss` from 4.2.4 to 4.3.0
- [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/v4.3.0/packages/@tailwindcss-postcss)

Updates `tailwindcss` from 4.2.4 to 4.3.0
- [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/v4.3.0/packages/tailwindcss)

---
updated-dependencies:
- dependency-name: "@tailwindcss/postcss"
  dependency-version: 4.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tailwind
- dependency-name: tailwindcss
  dependency-version: 4.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tailwind
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

web/package-lock.json

@@ -9,7 +9,7 @@
     "preview": "astro preview"
   },
   "dependencies": {
-    "@tailwindcss/postcss": "^4.2.4",
+    "@tailwindcss/postcss": "^4.3.0",
     "astro": "^6.3.1",
     "marked": "^18.0.3",
     "tailwindcss": "^4.2.4"