Reverse version bump of `async-tungstenite` #4290

Job	Run time
MSRV	3m 0s
Test (stable)	1m 31s
Test (beta)	1m 21s
Test (Windows)	4m 7s
Build docs	3m 7s
Test (native-tls)	4m 49s
Test (no default features)	1m 34s
Test (no cache)	4m 48s
Examples	4m 28s
Test (no gateway)	3m 4s
Test (time)	1m 12s
Test (unstable Discord API features)	1m 43s
Test (simd-json)	1m 54s
Test (macOS)	8m 0s
Test (chrono, chrono)	1m 11s
Test (builder without model, builder, true)	54s
Check minimal versions	3m 19s
Test (unstable Discord API (no default features), unstable_discord_api, true)	1m 13s
Test (nightly)	3m 10s
	54m 25s

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