Rename `dep_time` dependency to `time` #5924

Job	Run time
Build docs	57s
Examples	4m 31s
Test (macOS)	2m 26s
Check minimal versions	53s
MSRV	1m 6s
Test (nightly)	3m 5s
Test (stable)	3m 0s
Test (beta)	2m 53s
Test (Windows)	5m 49s
Test (native-tls)	2m 43s
Test (no default features)	1m 0s
Test (no cache)	2m 46s
Test (no gateway)	1m 51s
Test (unstable Discord API features)	2m 50s
Test (simd-json)	2m 56s
Test (chrono, chrono)	1m 1s
Test (unstable API + typesize, default unstable_discord_api typesize, true)	1m 22s
Test (builder without model, builder, true)	41s
Test (unstable Discord API (no default features), unstable_discord_api, true)	39s
	42m 29s

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