Fix CacheUpdate implementations for extra FullEvents #5877

Job	Run time
Examples	51s
Build docs	28s
Check minimal versions	31s
Test (macOS)	29s
MSRV	0s
Test (nightly)	29s
Test (stable)	41s
Test (beta)	28s
Test (Windows)	2m 31s
Test (native-tls)	36s
Test (no default features)	36s
Test (no cache)	2m 3s
Test (no gateway)	1m 56s
Test (unstable Discord API features)	40s
Test (zlib compression)	40s
Test (zstd compression)	38s
Test (zlib and zstd compression)	43s
Test (chrono, chrono)	35s
Test (unstable API + typesize, default unstable typesize, true)	39s
Test (builder without model, builder, true)	24s
Test (unstable Discord API (no default features), unstable, true)	25s
	16m 23s

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