Update css (#27948)

* Update css

* Hold back postcss somewhat

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

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Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

package.json

@@ -256,12 +256,12 @@
         "lint-staged": "^15.0.2",
         "mailhog": "^4.16.0",
         "matrix-web-i18n": "^3.2.1",
-        "mini-css-extract-plugin": "2.9.0",
+        "mini-css-extract-plugin": "2.9.2",
         "minimist": "^1.2.6",
         "modernizr": "^3.12.0",
         "node-fetch": "^2.6.7",
         "playwright-core": "^1.45.1",
-        "postcss": "8.4.38",
+        "postcss": "8.4.46",
         "postcss-easings": "^4.0.0",
         "postcss-hexrgba": "2.1.0",
         "postcss-import": "16.1.0",