chore(deps): update dependency @rsbuild/plugin-sass to ^1.4.0 (#329)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pnpm-lock.yaml

@@ -25,7 +25,7 @@
   "devDependencies": {
     "@rslint/wasm": "workspace:*",
     "@rslint/api": "workspace:*",
-    "@rsbuild/plugin-sass": "^1.3.5",
+    "@rsbuild/plugin-sass": "^1.4.0",
     "@rspress/core": "2.0.0-beta.27",
     "@rspress/plugin-llms": "2.0.0-beta.27",
     "@rstack-dev/doc-ui": "1.10.9",