clippy: await server process in interop tests #141

Job	Run time
docs	19s
docs	19s
docs	19s
cargo-deny (advisories)	20s
cargo-deny (advisories)	20s
cargo-deny (advisories)	20s
clippy	3m 23s
clippy	3m 23s
clippy	3m 23s
cargo-deny (bans licenses sources)	23s
cargo-deny (bans licenses sources)	23s
cargo-deny (bans licenses sources)	23s
fmt	13s
fmt	13s
fmt	13s
linux (stable)	47s
linux (stable)	47s
linux (stable)	49s
macos	1m 33s
macos	4m 6s
macos	4m 6s
windows	50s
windows	50s
windows	50s
	28m 32s

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