Merge pull request #660 from textpattern/dependabot/npm_and_yarn/postcss-8.5.1

Bump postcss from 8.4.49 to 8.5.1

Author: philwareham

package.json

@@ -25,7 +25,7 @@
     "grunt-stylelint": "0.20.1",
     "grunt-terser": "2.0.0",
     "load-grunt-tasks": "5.1.0",
-    "postcss": "8.4.49",
+    "postcss": "8.5.1",
     "sass": "1.83.1",
     "stylelint": "16.13.0",
     "stylelint-config-standard-scss": "14.0.0",