bump up the wasm-bindgen version in test?

[huangjj27]

💡 Feature description

I notice that different test use a different version of wasm-bindgen, I think we can use the same version(I mean always the newest version) of wasm-bindgen, so that ALL THE TEST would use the same cache

💻 Basic example

the test that use fixture has locked the wasm-bindgen and wasm-bindgen-test to version 0.2.21,(for example, it_should_build_js_hello_world_example) while other test that generates its fixture (for exmaple, build_with_and_without_wasm_bindgen_debug) may use just the auto-patching version config of 0.2.
that means we have to download at least 2 version of wasm-bindgen cache for testing, and that spends a lot of time (especially for worker in country with network inspection where slow down github).

but if we bump up the wasm-bindgen version of fixture to 0.2, we can use the same cache and will only fetch wasm-bindgen only one time.

related to #447

[ashleygwilliams]

@huangjj27 i'd happily accept a PR for this- this is a good catch! thanks for filing an issue!

[ashleygwilliams]

closing as we've landed #526 via #554