Removed Cargo workspace dependencies.

Downstream repos can't access the Cargo workspace, so we need to not rely on workspace dependencies for now.

Diffs=
b4ef09a6d Removed Cargo workspace dependencies. (#6089)

Co-authored-by: Dragoș Tiselice <dragos@rive.app>

.rive_head

diff --git a/.rive_head b/.rive_head
index ddd650c..0c71633 100644
--- a/.rive_head
+++ b/.rive_head
@@ -1 +1 @@
-c63346b93db6df8ecf299c44735cce95ccfbf2a8
+b4ef09a6d619423eb7a4b96d34d4acfd62dbc527

vello/Cargo.toml

diff --git a/vello/Cargo.toml b/vello/Cargo.toml
index 255a639..918353d 100644
--- a/vello/Cargo.toml
+++ b/vello/Cargo.toml
@@ -6,6 +6,6 @@
 [dependencies]
 pollster = "0.3.0"
 rive-rs = { path = "../../rive_rs", features = ["vello"] }
-vello = { workspace = true }
+vello = { git = "https://github.com/linebender/vello", rev = "ee3a076" }
 wgpu = "0.17.0"
 winit = "0.28.6"