Update CSS preprocessors

Author: renovate[bot]

package.json

@@ -45,10 +45,10 @@
     "contributors": "https://github.com/TryGhost/Source-ActivityPub/graphs/contributors",
     "devDependencies": {
         "@tailwindcss/cli": "4.3.2",
-        "autoprefixer": "10.5.2",
+        "autoprefixer": "10.5.4",
         "beeper": "2.1.0",
         "concurrently": "10.0.4",
-        "cssnano": "8.0.2",
+        "cssnano": "8.0.3",
         "gscan": "6.4.2",
         "gulp": "5.0.1",
         "gulp-concat": "2.6.1",