chore(deps): bump postcss from 8.4.6 to 8.4.7 in /install

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.6 to 8.4.7.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.4.6...8.4.7)

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

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

install/package.json

@@ -106,7 +106,7 @@
         "passport-local": "1.0.0",
         "pg": "8.7.3",
         "pg-cursor": "2.7.3",
-        "postcss": "8.4.6",
+        "postcss": "8.4.7",
         "postcss-clean": "1.2.0",
         "prompt": "1.2.2",
         "ioredis": "4.28.5",