Upgrade lightningcss to 1.29.1 in standalone package (#15641)

Closes #15636
Closes #15638
Closes #15637

I noticed that I forgot to update the bundled `lightningcss`
dependencies in the `standalone` project. This makes sure we have the
same version everywhere.

Author: philipp-spiess

packages/@tailwindcss-standalone/package.json

@@ -44,12 +44,12 @@
     "@parcel/watcher-win32-x64": "^2.5.0",
     "@types/bun": "^1.1.16",
     "bun": "1.1.43",
-    "lightningcss-darwin-arm64": "^1.25.1",
-    "lightningcss-darwin-x64": "^1.25.1",
-    "lightningcss-linux-arm64-gnu": "^1.25.1",
-    "lightningcss-linux-arm64-musl": "^1.25.1",
-    "lightningcss-linux-x64-gnu": "^1.25.1",
-    "lightningcss-linux-x64-musl": "^1.25.1",
-    "lightningcss-win32-x64-msvc": "^1.25.1"
+    "lightningcss-darwin-arm64": "^1.29.1",
+    "lightningcss-darwin-x64": "^1.29.1",
+    "lightningcss-linux-arm64-gnu": "^1.29.1",
+    "lightningcss-linux-arm64-musl": "^1.29.1",
+    "lightningcss-linux-x64-gnu": "^1.29.1",
+    "lightningcss-linux-x64-musl": "^1.29.1",
+    "lightningcss-win32-x64-msvc": "^1.29.1"
   }
 }