Don't use path dependencies in examples

This commit updates all examples to not use `path` dependencies but
rather use versioned dependencies like would typically be found in the
wild. This should hopefully make the examples more copy-pastable and
less alien to onlookers!

The development of the examples remains the same where they continue to
use the `wasm-bindgen`, `js-sys`, `web-sys`, etc from in-tree. The
workspace-level `[patch]` section ensures that they use the in-tree
versions instead of the crates.io versions.

examples/canvas/Cargo.toml

@@ -7,11 +7,11 @@ authors = ["The wasm-bindgen Developers"]
 crate-type = ["cdylib"]
 
 [dependencies]
-js-sys = { path = "../../crates/js-sys" }
-wasm-bindgen = { path = "../.." }
+js-sys = "0.3.4"
+wasm-bindgen = "0.2.27"
 
 [dependencies.web-sys]
-path = "../../crates/web-sys"
+version = "0.3.4"
 features = [
   'CanvasRenderingContext2d',
   'Document',