chore(deps): bump postcss from 8.5.19 to 8.5.23 in /web

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.19 to 8.5.23.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.19...8.5.23)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.23
  dependency-type: direct:production
...

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

Author: dependabot[bot]

web/ee/package.json

@@ -64,7 +64,7 @@
         "jsonrepair": "^3.13.3",
         "lodash": "^4.17.23",
         "next": "15.5.21",
-        "postcss": "^8.5.10",
+        "postcss": "^8.5.23",
         "posthog-js": "^1.223.3",
         "rc-virtual-list": "^3.19.2",
         "react": "^19.0.0",

web/oss/package.json

@@ -108,7 +108,7 @@
         "next": "15.5.21",
         "papaparse": "^5.5.3",
         "pdfjs-dist": "^4.10.38",
-        "postcss": "^8.5.10",
+        "postcss": "^8.5.23",
         "posthog-js": "^1.223.3",
         "prismjs": "^1.30.0",
         "rc-virtual-list": "^3.19.2",