Update dependency postcss-loader to v8.2.0 (#11822)

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

Author: renovate[bot]

package.json

@@ -140,7 +140,7 @@
     "nyc": "17.1.0",
     "playwright-msw": "3.0.1",
     "postcss": "8.5.6",
-    "postcss-loader": "8.1.1",
+    "postcss-loader": "8.2.0",
     "postcss-preset-env": "10.3.1",
     "prettier": "3.6.2",
     "prettier-plugin-ember-template-tag": "2.1.0",