chore(deps): update dependency postcss to v8.5.13 (#518)

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

Author: renovate[bot]

src/theme/static_src/package-lock.json

@@ -19,7 +19,7 @@
     "@tailwindcss/line-clamp": "0.4.4",
     "@tailwindcss/typography": "0.5.19",
     "cross-env": "10.0.0",
-    "postcss": "8.5.12",
+    "postcss": "8.5.13",
     "postcss-import": "16.1.1",
     "postcss-nested": "7.0.2",
     "postcss-simple-vars": "7.0.1",