Update dependency postcss to v8.5.26 (#19799)

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

package.json

@@ -108,7 +108,7 @@
     "oxc-parser": "0.143.0",
     "parse-json": "8.3.0",
     "picocolors": "1.1.1",
-    "postcss": "8.5.25",
+    "postcss": "8.5.26",
     "postcss-less": "6.0.0",
     "postcss-media-query-parser": "0.2.3",
     "postcss-scss": "4.0.9",