Fix some deprecation warnings

[RandomInsano]

A few APIs have changed in web-sys. This resolves some deprecation warnings.

[wishawa]

Can you bump the web-sys version in Cargo.toml to correspond to the new APIs too?

[RandomInsano]

Heya! I'm taking a look at this today... It looks like a lot more care (beyond my knowledge is needed here).

I didn't change any of actual dependencies and just fixed what errored out of the box (I think the version pinning didn't quite work). Running on rustc 1.84.0. I'll pin wasm-bindgen to 0.2.100 so more things don't drift out, but there's a lot more warnings to be fixed in the CSS macro I'm not skilled enough yet to handle.

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warning: `web-simple-examples` (lib) generated 18 warnings
warning: `big-list` (lib) generated 3 warnings
warning: `x-bow-playground` (lib) generated 3 warnings
warning: `web-todomvc` (lib) generated 4 warnings
warning: `guide-project` (lib) generated 26 warnings
warning: `async_ui_web_draggable` (lib) generated 3 warnings