Fix CacheUpdate implementations for extra FullEvents #1038

Job	Run time
Examples	1m 9s
Build docs	50s
Test (macOS)	42s
MSRV	0s
Test (nightly)	56s
Check minimal versions	45s
Test (stable)	1m 1s
Test (beta)	1m 5s
Test (Windows)	2m 1s
Test (native-tls)	38s
Test (no default features)	41s
Test (no cache)	2m 10s
Test (no gateway)	1m 43s
Test (unstable Discord API features)	40s
Test (zlib compression)	38s
Test (zstd compression)	42s
Test (zlib and zstd compression)	46s
Test (chrono, chrono)	45s
Test (unstable API + typesize, default unstable typesize, true)	41s
Test (builder without model, builder, true)	25s
Test (unstable Discord API (no default features), unstable, true)	27s
	18m 45s

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