Fix flaky tests #2296

Job	Run time
build_examples	4m 15s
build_benchmarks	56s
build_nightly	1m 39s
Check	1m 3s
Verify that web-sys is compiled correctly	50s
Clippy	7m 17s
dist_linux_aarch64_gnu	2m 52s
dist_linux_x86_64_musl	2m 29s
dist_macos_aarch64	1m 14s
dist_macos_x86_64	1m 17s
dist_windows	3m 39s
doc_api	1m 18s
doc_book	5s
Check MSRV for CLI tools	29s
Check MSRV for libraries	2m 22s
Rustfmt	13s
Build and test the deno example	1m 8s
Run js-sys crate tests	2m 24s
Run native tests	2m 3s
Run wasm-bindgen crate tests with multithreading enabled	1m 18s
Test TypeScript output of wasm-bindgen	1m 48s
Run UI compile-fail tests	46s
Run wasm-bindgen crate tests (unix)	5m 35s
Run web-sys crate tests	5m 58s
Run wasm-bindgen-webidl crate tests	2m 13s
deploy	37s
test_examples	2m 8s
	57m 56s

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