Revert tailwindcss v4 update (#16075)

## Summary

Revert the v4 update for now until the codebase is updated
(#16069).

Update renovate config to disable updating it.

## Test Plan

```console
$ npx --yes --package renovate -- renovate-config-validator
(node:98977) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
 INFO: Validating .github/renovate.json5
 INFO: Config validated successfully
```

And run `npm run build` in the `playground/` directory.

.github/renovate.json5

@@ -58,6 +58,12 @@
       description: "Disable PRs updating GitHub runners (e.g. 'runs-on: macos-14')",
       enabled: false,
     },
+    {
+      // TODO: Remove this once the codebase is upgrade to v4 (https://github.com/astral-sh/ruff/pull/16069)
+      matchPackageNames: ["tailwindcss"],
+      matchManagers: ["npm"],
+      enabled: false,
+    },
     {
       // Disable updates of `zip-rs`; intentionally pinned for now due to ownership change
       // See: https://github.com/astral-sh/uv/issues/3642