chore(deps): update dependency postcss to v8.5.16 (#723)

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

Author: renovate[bot]

devtools/panels/grpc/package.json

@@ -48,7 +48,7 @@
     "html-webpack-plugin": "5.6.7",
     "jest": "30.4.2",
     "jest-environment-jsdom": "30.4.1",
-    "postcss": "8.5.15",
+    "postcss": "8.5.16",
     "postcss-loader": "8.2.1",
     "rimraf": "6.1.3",
     "style-loader": "4.0.0",