Bump postcss from 8.4.21 to 8.4.31 in /linkis-web

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.21 to 8.4.31.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.21...8.4.31)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

linkis-web/package.json

@@ -40,7 +40,7 @@
         "monaco-editor": "0.30.1",
         "object-to-formdata": "4.2.2",
         "path-browserify": "1.0.1",
-        "postcss": "8.4.21",
+        "postcss": "8.4.31",
         "qs": "6.11.0",
         "reconnecting-websocket": "4.4.0",
         "sql-formatter": "2.3.3",
@@ -78,6 +78,6 @@
         "webpack-virtual-modules": "0.3.2"
     },
     "resolutions": {
-        "postcss": "8.4.21"
+        "postcss": "8.4.31"
     }
 }