Upgrade lightningcss to 1.29.1 (tailwindlabs#15593)

Upgrading `lightningcss` to fix invalid `list-style: none` conversion.
I've also reverted the change to preflight while at it, since it's no
longer necessary.

Author: philipp-spiess

package.json

@@ -63,7 +63,7 @@
   "packageManager": "pnpm@9.6.0",
   "pnpm": {
     "patchedDependencies": {
-      "lightningcss@1.29.0": "patches/lightningcss@1.29.0.patch",
+      "lightningcss@1.29.1": "patches/lightningcss@1.29.1.patch",
       "@parcel/watcher@2.5.0": "patches/@parcel__watcher@2.5.0.patch"
     }
   }

packages/@tailwindcss-postcss/src/__snapshots__/index.test.ts.snap

@@ -472,7 +472,7 @@ exports[`\`@import 'tailwindcss'\` is replaced with the generated CSS 1`] = `
   }
 
   ol, ul, menu {
-    list-style-type: none;
+    list-style: none;
   }
 
   img, svg, video, canvas, audio, iframe, embed, object {

packages/tailwindcss/preflight.css

@@ -205,7 +205,7 @@ summary {
 ol,
 ul,
 menu {
-  list-style-type: none;
+  list-style: none;
 }
 
 /*