build(deps-dev): bump postcss from 8.4.7 to 8.4.8 in /packages/dashboard

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.7 to 8.4.8.
- [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/8.4.7...8.4.8)

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

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

packages/dashboard/package.json

@@ -37,7 +37,7 @@
     "autoprefixer": "10.4.2",
     "eslint": "8.10.0",
     "eslint-config-next": "12.1.0",
-    "postcss": "8.4.7",
+    "postcss": "8.4.8",
     "prettier": "2.5.1",
     "tailwindcss": "3.0.23"
   }

packages/dashboard/yarn.lock

@@ -1941,10 +1941,10 @@ postcss@8.4.5:
     picocolors "^1.0.0"
     source-map-js "^1.0.1"
 
-postcss@8.4.7, postcss@^8.4.6:
-  version "8.4.7"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.7.tgz#f99862069ec4541de386bf57f5660a6c7a0875a8"
-  integrity sha512-L9Ye3r6hkkCeOETQX6iOaWZgjp3LL6Lpqm6EtgbKrgqGGteRMNb9vzBfRL96YOSu8o7x3MfIH9Mo5cPJFGrW6A==
+postcss@8.4.8, postcss@^8.4.6:
+  version "8.4.8"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.8.tgz#dad963a76e82c081a0657d3a2f3602ce10c2e032"
+  integrity sha512-2tXEqGxrjvAO6U+CJzDL2Fk2kPHTv1jQsYkSoMeOis2SsYaXRO2COxTdQp99cYvif9JTXaAk9lYGc3VhJt7JPQ==
   dependencies:
     nanoid "^3.3.1"
     picocolors "^1.0.0"