chore: release v3.9.1 #1536

Job	Run time
cargo-fmt	24s
cargo-lock	7s
version-sync	7s
cargo-miri	1m 43s
test-unstable (beta, --locked)	32s
prettier	10s
compilation-benchmarks	2m 10s
cargo-miri (--locked)	1m 46s
typos	4s
test-unstable (beta)	35s
test-unstable (nightly)	35s
test-unstable (nightly, --locked)	33s
cargo-machete	6s
taplo-fmt	5s
cargo-doc (macos)	37s
test-stable (ubuntu, --locked)	48s
website-build	24s
cargo-doc (ubuntu)	25s
cargo-doc (windows)	1m 9s
test-stable (ubuntu)	48s
runtime-benchmarks (args_5)	1m 11s
test-stable (windows)	2m 24s
runtime-benchmarks (args_3)	1m 7s
runtime-benchmarks (args_10_alloc)	1m 9s
test-stable (macos)	58s
test-stable (macos, --locked)	1m 4s
test-stable (windows, --locked)	2m 23s
runtime-benchmarks (args_10_structs)	1m 15s
test-msrv (windows, 1.61.0)	17m 0s
runtime-benchmarks (args_10)	1m 10s
runtime-benchmarks (args_20)	1m 12s
test-msrv (macos, 1.59.0)	9m 3s
test-msrv (windows, 1.59.0)	17m 39s
test-msrv (macos, 1.61.0)	8m 53s
test-msrv (ubuntu, 1.61.0)	8m 10s
test-msrv (ubuntu, 1.59.0)	10m 43s
	1h 38m 29s

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