Fix CacheUpdate implementations for extra FullEvents #1044

Job	Run time
Build docs	41s
Examples	1m 10s
Check minimal versions	45s
Test (macOS)	51s
MSRV	0s
Test (nightly)	1m 8s
Test (stable)	45s
Test (beta)	1m 2s
Test (Windows)	2m 48s
Test (native-tls)	42s
Test (no default features)	39s
Test (no cache)	2m 6s
Test (no gateway)	1m 52s
Test (unstable Discord API features)	45s
Test (zlib compression)	40s
Test (zstd compression)	38s
Test (zlib and zstd compression)	38s
Test (chrono, chrono)	40s
Test (unstable API + typesize, default unstable typesize, true)	40s
Test (builder without model, builder, true)	29s
Test (unstable Discord API (no default features), unstable, true)	21s
	19m 20s

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