chore(deps-dev): bump postcss from 8.4.29 to 8.4.31 (#225)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.29 to 8.4.31.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.29...8.4.31)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
...

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

Author: dependabot[bot]

package.json

@@ -61,7 +61,7 @@
     "eslint-plugin-react": "^7.31.11",
     "eslint-plugin-react-hooks": "^4.6.0",
     "gatsby-cli": "^5.0.0",
-    "postcss": "^8.4.20",
+    "postcss": "^8.4.31",
     "postcss-scss": "^4.0.6",
     "prettier": "^2.8.1",
     "remark-cli": "^11.0.0",

yarn.lock

@@ -10603,10 +10603,10 @@ [email protected]:
     source-map "^0.6.1"
     supports-color "^6.1.0"
 
-postcss@^8.2.15, postcss@^8.2.9, postcss@^8.3.11, postcss@^8.4.19, postcss@^8.4.20, postcss@^8.4.21:
-  version "8.4.29"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.29.tgz#33bc121cf3b3688d4ddef50be869b2a54185a1dd"
-  integrity sha512-cbI+jaqIeu/VGqXEarWkRCCffhjgXc0qjBtXpqJhTBohMUjUQnbBr0xqX3vEKudc4iviTewcJo5ajcec5+wdJw==
+postcss@^8.2.15, postcss@^8.2.9, postcss@^8.3.11, postcss@^8.4.19, postcss@^8.4.21, postcss@^8.4.31:
+  version "8.4.31"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.31.tgz#92b451050a9f914da6755af352bdc0192508656d"
+  integrity sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==
   dependencies:
     nanoid "^3.3.6"
     picocolors "^1.0.0"