Bump postcss from 8.5.15 to 8.5.23 (#166)

Author: dependabot[bot]

package-lock.json

@@ -88,7 +88,7 @@
     "jest": "^30.2.0",
     "jest-canvas-mock": "^2.4.0",
     "jest-environment-jsdom": "^30.2.0",
-    "postcss": "^8.5.14",
+    "postcss": "^8.5.23",
     "prettier": "^2.8.2",
     "prettier-eslint": "^16.4.2",
     "react-test-renderer": "^18.2.0",