Bump postcss from 8.4.26 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.26 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@8.4.26...8.4.31)

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

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -114,7 +114,7 @@
     "micromark-extension-frontmatter": "^1.0.0",
     "micromark-extension-gfm": "2.0.1",
     "micromark-extension-mdxjs": "^1.0.0",
-    "postcss": "^8.4.12",
+    "postcss": "^8.4.31",
     "postcss-flexbugs-fixes": "^5.0.2",
     "postcss-loader": "^7.3.3",
     "postcss-preset-env": "^7.4.4",

yarn.lock

@@ -15753,10 +15753,10 @@ [email protected]:
     picocolors "^1.0.0"
     source-map-js "^1.0.2"
 
-postcss@^8.2.14, postcss@^8.4.12, postcss@^8.4.21, postcss@^8.4.25:
-  version "8.4.26"
-  resolved "https://registry.npmjs.org/postcss/-/postcss-8.4.26.tgz#1bc62ab19f8e1e5463d98cf74af39702a00a9e94"
-  integrity sha512-jrXHFF8iTloAenySjM/ob3gSj7pCu0Ji49hnjqzsgSRa50hkWCKD0HQ+gMNJkW38jBI68MpAAg7ZWwHwX8NMMw==
+postcss@^8.2.14, postcss@^8.4.21, postcss@^8.4.25, 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"