Pin web-sys dependency to < 0.3.70. (#159) #241

Job	Run time
Test Suite	4m 53s
Rustfmt	16s
Check	2m 5s
build (macos-latest, aarch64-apple-darwin)	2m 9s
Check wasm32	1m 25s
Clippy	2m 14s
build (ubuntu-latest, aarch64-unknown-linux-gnu)	4m 27s
build (ubuntu-latest, armv7-unknown-linux-gnueabihf)	4m 18s
build (ubuntu-latest, x86_64-unknown-linux-gnu)	4m 7s
build (windows-latest, x86_64-pc-windows-msvc, .exe)	5m 8s
trunk	1m 39s
	32m 41s

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