Fix CacheUpdate implementations for extra FullEvents #5851

Job	Run time
Examples	1m 9s
Test (macOS)	1m 6s
Build docs	49s
Check minimal versions	29s
MSRV	0s
Test (nightly)	1m 0s
Test (stable)	1m 4s
Test (beta)	29s
Test (Windows)	3m 1s
Test (native-tls)	53s
Test (no default features)	54s
Test (no cache)	2m 33s
Test (no gateway)	1m 50s
Test (unstable Discord API features)	53s
Test (zlib compression)	51s
Test (zstd compression)	54s
Test (zlib and zstd compression)	52s
Test (chrono, chrono)	53s
Test (unstable API + typesize, default unstable typesize, true)	49s
Test (builder without model, builder, true)	33s
Test (unstable Discord API (no default features), unstable, true)	40s
	21m 42s

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