Bump postcss from 8.4.19 to 8.4.20 (#6730)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.19 to 8.4.20.
- [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/8.4.19...8.4.20)

---
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

@@ -387,7 +387,7 @@
     "node-loader": "^2.0.0",
     "nodemon": "^2.0.20",
     "playwright": "^1.28.1",
-    "postcss": "^8.4.19",
+    "postcss": "^8.4.20",
     "postcss-loader": "^6.2.1",
     "query-string": "^7.1.3",
     "randomcolor": "^0.6.2",

yarn.lock

@@ -10354,10 +10354,10 @@ postcss@^6.0.14, postcss@^6.0.2:
     source-map "^0.6.1"
     supports-color "^5.4.0"
 
-postcss@^8.3.0, postcss@^8.4.18, postcss@^8.4.19:
-  version "8.4.19"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.19.tgz#61178e2add236b17351897c8bcc0b4c8ecab56fc"
-  integrity sha512-h+pbPsyhlYj6N2ozBmHhHrs9DzGmbaarbLvWipMRO7RLS+v4onj26MPFXA5OBYFxyqYhUJK456SwDcY9H2/zsA==
+postcss@^8.3.0, postcss@^8.4.18, postcss@^8.4.20:
+  version "8.4.20"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.20.tgz#64c52f509644cecad8567e949f4081d98349dc56"
+  integrity sha512-6Q04AXR1212bXr5fh03u8aAwbLxAQNGQ/Q1LNa0VfOI06ZAlhPHtQvE4OIdpj4kLThXilalPnmDSOD65DcHt+g==
   dependencies:
     nanoid "^3.3.4"
     picocolors "^1.0.0"