test: flaky rpc #3546

Job	Run time
clippy	46s
doctest	1m 15s
feature-checks	3m 2s
no-std	19s
wasm-unknown	46s
test ubuntu-latest stable --no-default-features	1m 27s
wasm-wasi	1m 13s
test ubuntu-latest stable	1m 30s
test ubuntu-latest stable --all-features	2m 20s
cfg-check	23s
test ubuntu-latest nightly --no-default-features	1m 15s
docs	53s
test ubuntu-latest nightly	1m 11s
fmt	12s
test ubuntu-latest nightly --all-features	1m 58s
test ubuntu-latest 1.76 --no-default-features	36s
test ubuntu-latest 1.76	42s
test windows-latest stable --no-default-features	4m 22s
test windows-latest stable	3m 46s
test windows-latest stable --all-features	5m 18s
test windows-latest nightly --no-default-features	3m 32s
test windows-latest nightly	3m 10s
test windows-latest nightly --all-features	4m 30s
test windows-latest 1.76 --no-default-features	1m 59s
test windows-latest 1.76	2m 16s
	48m 41s

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