Increase the connections opening rate limit #4246

Job	Run time
wasm-node-check	2m 5s
test-32bits	6m 9s
cargo-deny (bans licenses sources)	27s
cargo-spellcheck	27s
check-no-std	1m 34s
check-features	3m 10s
check-rustdoc-links	47s
clippy	39s
fmt	35s
fuzzing-binaries-compile	4m 54s
test-64bits	6m 37s
wasm-node-versions-match	31s
all-ci	1s
	27m 56s

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