Fix clippy warning on next #5868

Job	Run time
Test (macOS)	1m 14s
Test (nightly)	1m 48s
Test (stable)	2m 25s
Test (beta)	2m 49s
Examples	2m 27s
Test (Windows)	4m 28s
Build docs	41s
Test (native-tls)	2m 14s
Check minimal versions	26s
Test (no default features)	40s
MSRV	0s
Test (no cache)	2m 19s
Test (no gateway)	1m 43s
Test (unstable Discord API features)	2m 49s
Test (zlib compression)	2m 26s
Test (zstd compression)	2m 18s
Test (zlib and zstd compression)	2m 26s
Test (chrono, chrono)	58s
Test (unstable API + typesize, default unstable typesize, true)	47s
Test (builder without model, builder, true)	24s
Test (unstable Discord API (no default features), unstable, true)	17s
	35m 39s

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