chore: align differently used Rust versions #1161

Job	Run time
clippy-codegen	37s
format	19s
clippy (async-std-surf)	1m 31s
generate-public-api	2m 48s
clippy (tokio-hyper)	1m 13s
clippy (tokio-hyper-rustls)	1m 13s
test (async-std-surf)	4m 36s
verify-codegen	1m 2s
clippy (tokio-hyper-rustls-webpki)	1m 20s
test (tokio-hyper)	5m 44s
clippy (blocking)	1m 24s
test (tokio-hyper-rustls)	5m 51s
clippy (blocking-rustls)	1m 11s
test (tokio-hyper-rustls-webpki)	4m 40s
clippy (blocking-rustls-webpki)	1m 15s
test (blocking)	5m 58s
test (blocking-rustls)	5m 42s
test (blocking-rustls-webpki)	4m 42s
	51m 6s

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