Fix compilation when the `tracing_instrument` feature is enabled (#3110) #1098

# to view logs

Job	Run time
Build docs	51s
Examples	3m 4s
Test (macOS)	2m 15s
Check minimal versions	55s
MSRV	0s
Test (nightly)	1m 54s
Test (stable)	2m 17s
Test (beta)	2m 22s
Test (Windows)	6m 23s
Test (native-tls)	2m 3s
Test (no default features)	46s
Test (no cache)	2m 5s
Test (no gateway)	1m 34s
Test (unstable Discord API features)	2m 20s
Test (zlib compression)	2m 16s
Test (zstd compression)	2m 19s
Test (zlib and zstd compression)	2m 10s
Test (chrono, chrono)	57s
Test (unstable API + typesize, default unstable typesize, true)	1m 4s
Test (builder without model, builder, true)	36s
Test (unstable Discord API (no default features), unstable, true)	38s
	38m 49s

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