Fix CacheUpdate implementations for extra FullEvents #5939

Job	Run time
Build docs	20s
Test (macOS)	42s
Check minimal versions	31s
Test (nightly)	33s
Test (stable)	53s
Examples	48s
Test (beta)	28s
MSRV	0s
Test (Windows)	1m 55s
Test (native-tls)	58s
Test (no default features)	40s
Test (no cache)	1m 50s
Test (no gateway)	1m 28s
Test (unstable Discord API features)	52s
Test (zlib compression)	54s
Test (zstd compression)	48s
Test (zlib and zstd compression)	51s
Test (chrono, chrono)	39s
Test (unstable API + typesize, default unstable typesize, true)	47s
Test (builder without model, builder, true)	26s
Test (unstable Discord API (no default features), unstable, true)	27s
	16m 50s

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