Update selected dependencies (#7920)

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A number of separate commits to possibly easily revert some of them.

General idea: selectively update dependencies to remove transitive
dependencies and multiple versions etc. As well as updating "major" (the
one that `cargo update` doesn't update) version for some in Cargo.toml.

Rendering pipelines in `vello_cpu` wasn't obvious. Now both are used.

crates/egui_kittest/Cargo.toml

@@ -38,7 +38,7 @@ egui.workspace = true
 eframe = { workspace = true, optional = true }
 kittest.workspace = true
 serde.workspace = true
-toml.workspace = true
+toml = {workspace = true, features = ["parse", "serde"] }
 
 # wgpu dependencies
 egui-wgpu = { workspace = true, optional = true }