Re-land taffy 0.8.3 (#34939)

Re #34938
- **chore: Bump taffy to 0.8.3**
- **editor: Fix sticky multi-buffer header not extending to the full
width**


Release Notes:

- N/A

Cargo.lock

@@ -7402,9 +7402,9 @@ dependencies = [
 
 [[package]]
 name = "grid"
-version = "0.14.0"
+version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be136d9dacc2a13cc70bb6c8f902b414fb2641f8db1314637c6b7933411a8f82"
+checksum = "71b01d27060ad58be4663b9e4ac9e2d4806918e8876af8912afbddd1a91d5eaa"
 
 [[package]]
 name = "group"
@@ -15961,13 +15961,12 @@ dependencies = [
 
 [[package]]
 name = "taffy"
-version = "0.5.1"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e8b61630cba2afd2c851821add2e1bb1b7851a2436e839ab73b56558b009035e"
+checksum = "7aaef0ac998e6527d6d0d5582f7e43953bb17221ac75bb8eb2fcc2db3396db1c"
 dependencies = [
  "arrayvec",
  "grid",
- "num-traits",
  "serde",
  "slotmap",
 ]