Pin dependencies (#11690)

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

Author: renovate[bot]

package.json

@@ -134,8 +134,8 @@
     "msw": "2.10.4",
     "nyc": "17.1.0",
     "playwright-msw": "3.0.1",
-    "postcss": "^8.5.6",
-    "postcss-loader": "^8.1.1",
+    "postcss": "8.5.6",
+    "postcss-loader": "8.1.1",
     "postcss-preset-env": "10.2.4",
     "prettier": "3.6.2",
     "qunit": "2.24.1",