build(deps-dev): bump postcss from 8.4.17 to 8.4.18 (webpack#6452)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.17 to 8.4.18.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.17...8.4.18)

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

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

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

package.json

@@ -113,7 +113,7 @@
     "modularscale-sass": "^3.0.3",
     "node-fetch": "^3.2.10",
     "npm-run-all": "^4.1.1",
-    "postcss": "^8.4.17",
+    "postcss": "^8.4.18",
     "postcss-loader": "^7.0.1",
     "prettier": "^2.7.1",
     "react-refresh": "^0.14.0",

yarn.lock

@@ -9643,10 +9643,10 @@ postcss@^5.0.8, postcss@^5.2.4:
     source-map "^0.5.6"
     supports-color "^3.2.3"
 
-postcss@^8.3.10, postcss@^8.4.14, postcss@^8.4.17, postcss@^8.4.7:
-  version "8.4.17"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.17.tgz#f87863ec7cd353f81f7ab2dec5d67d861bbb1be5"
-  integrity sha512-UNxNOLQydcOFi41yHNMcKRZ39NeXlr8AxGuZJsdub8vIb12fHzcq37DTU/QtbI6WLxNg2gF9Z+8qtRwTj1UI1Q==
+postcss@^8.3.10, postcss@^8.4.14, postcss@^8.4.17, postcss@^8.4.18, postcss@^8.4.7:
+  version "8.4.18"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.18.tgz#6d50046ea7d3d66a85e0e782074e7203bc7fbca2"
+  integrity sha512-Wi8mWhncLJm11GATDaQKobXSNEYGUHeQLiQqDFG1qQ5UTDPTEvKw0Xt5NsTpktGTwLps3ByrWsBrG0rB8YQ9oA==
   dependencies:
     nanoid "^3.3.4"
     picocolors "^1.0.0"