Bump postcss from 8.4.33 to 8.4.34 in /web (#866)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.33 to 8.4.34.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.33...8.4.34)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

web/package.json

@@ -28,7 +28,7 @@
     "normalize-url": ">=8.0.0",
     "nth-check": "^2.1.1",
     "path-parse": ">=1.0.7",
-    "postcss": "^8.4.33",
+    "postcss": "^8.4.34",
     "react": "^17.0.1",
     "react-bootstrap": "^2.10.0",
     "react-dev-utils": ">=11.0.4",