Update dependency postcss to v8.5.4 (#3061)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

website/yarn.lock

@@ -757,10 +757,10 @@ mz@^2.7.0:
     object-assign "^4.0.1"
     thenify-all "^1.0.0"
 
-nanoid@^3.3.8:
-  version "3.3.9"
-  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.3.9.tgz#e0097d8e026b3343ff053e9ccd407360a03f503a"
-  integrity sha512-SppoicMGpZvbF1l3z4x7No3OlIjP7QJvC9XR7AhZr1kL133KHnKPztkKDc+Ir4aJ/1VhTySrtKhrsycmrMQfvg==
+nanoid@^3.3.11:
+  version "3.3.11"
+  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.3.11.tgz#4f4f112cefbe303202f2199838128936266d185b"
+  integrity sha512-N8SpfPUnUp1bK+PMYW8qSWdl9U+wwNWI4QKxOYDy9JAro3WMX7p2OeVRF9v+347pnakNevPmiHhNmZ2HbFA76w==
 
 node-releases@^2.0.19:
   version "2.0.19"
@@ -1158,11 +1158,11 @@ postcss-value-parser@^4.0.0, postcss-value-parser@^4.2.0:
   integrity sha512-1NNCs6uurfkVbeXG4S8JFT9t19m45ICnif8zWLd5oPSZ50QnwMfK+H3jv408d4jw/7Bttv5axS5IiHoLaVNHeQ==
 
 postcss@^8.4.4, postcss@^8.4.47, postcss@^8.4.5:
-  version "8.5.3"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.5.3.tgz#1463b6f1c7fb16fe258736cba29a2de35237eafb"
-  integrity sha512-dle9A3yYxlBSrt8Fu+IpjGT8SY8hN0mlaA6GY8t0P5PjIOZemULz/E2Bnm/2dcUOena75OTNkHI76uZBNUUq3A==
+  version "8.5.4"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.5.4.tgz#d61014ac00e11d5f58458ed7247d899bd65f99c0"
+  integrity sha512-QSa9EBe+uwlGTFmHsPKokv3B/oEMQZxfqW0QqNCyhpa6mB1afzulwn8hihglqAb2pOw+BJgNlmXQ8la2VeHB7w==
   dependencies:
-    nanoid "^3.3.8"
+    nanoid "^3.3.11"
     picocolors "^1.1.1"
     source-map-js "^1.2.1"