Toolchain deps update

[guybedford]

Updates to the latest toolchain dependencies including Wasmtime 19.

Also includes some features and fixes:

• Refined error handling resolving Non-conformant exceptions should unwrap as traps #405. JS errors from imported JS functions now only coerce into results when the top-level result accepts a string error type, otherwise the JS error will trap.
• Fixes a regression with the timeout API
• Fixes the connection timeout support to pass the new Wasmtime test for that

[landonxjames]

I think the firstByteTimeout and betweenBytesTimeout need this division step as well?

jco/packages/preview2-shim/lib/io/worker-http.js

Lines 150 to 154 in 961feb7

	if (firstByteTimeout) res.setTimeout(Number(firstByteTimeout));
	if (betweenBytesTimeout)
	res.once("readable", () => {
	res.setTimeout(Number(betweenBytesTimeout));
	});

[guybedford]

Great catch, thanks, added #409.