chore: Bump taffy version to 0.4.3 (#11606)

Taffy 0.4 has been released 2 months ago. We've been using an older
commit from their 0.4 development branch since November.
Compared to the commit we were pinned to, the following relevant changes
have been made:
-
https://github.com/DioxusLabs/taffy/commit/563d5dcee7b9138b4c3f865155d036a8b7597e65
-
https://github.com/DioxusLabs/taffy/commit/64f8aa0fb114d939ca0d53ddc44045a03fde548d
-
https://github.com/DioxusLabs/taffy/commit/70b35712a2e79b6fdfef4cff4392ca94287cd0b1

![image](https://github.com/zed-industries/zed/assets/24362066/ffdfae03-2743-496f-bb21-7aa38462178f)

Release Notes:

- N/A

Cargo.lock

@@ -4654,9 +4654,9 @@ dependencies = [
 
 [[package]]
 name = "grid"
-version = "0.11.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1df00eed8d1f0db937f6be10e46e8072b0671accb504cf0f959c5c52c679f5b9"
+checksum = "d196ffc1627db18a531359249b2bf8416178d84b729f3cebeb278f285fb9b58c"
 
 [[package]]
 name = "group"
@@ -9895,12 +9895,14 @@ dependencies = [
 
 [[package]]
 name = "taffy"
-version = "0.3.11"
-source = "git+https://github.com/DioxusLabs/taffy?rev=1876f72bee5e376023eaa518aa7b8a34c769bd1b#1876f72bee5e376023eaa518aa7b8a34c769bd1b"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7b2e140b328c6cb5e744bb2c65910b47df86b239afc793ee2c52262569cf9225"
 dependencies = [
  "arrayvec",
  "grid",
  "num-traits",
+ "serde",
  "slotmap",
 ]