Prepare for v0.12.5 #6398

Job	Run time
Test (nightly)	30s
Build docs	28s
Check minimal versions	38s
Examples	3m 35s
Test (beta)	2m 10s
Test (native-tls)	1m 48s
MSRV	58s
Test (macOS)	1m 49s
Test (stable)	1m 54s
Test (Windows)	5m 4s
Test (no cache)	1m 39s
Test (no default features)	53s
Test (unstable Discord API features)	2m 0s
Test (no gateway)	1m 40s
Test (simd-json)	2m 12s
Test (unstable API + typesize, default unstable_discord_api typesize, true)	1m 8s
Test (builder without model, builder, true)	31s
Test (unstable Discord API (no default features), unstable_discord_api, true)	37s
Test (chrono, chrono)	1m 5s
	30m 39s

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