Fix CacheUpdate implementations for extra FullEvents #1027

Job	Run time
Build docs	39s
Examples	1m 13s
Test (macOS)	1m 16s
Check minimal versions	50s
MSRV	0s
Test (nightly)	57s
Test (stable)	59s
Test (beta)	59s
Test (Windows)	2m 34s
Test (native-tls)	58s
Test (no default features)	1m 4s
Test (no cache)	2m 31s
Test (no gateway)	1m 54s
Test (unstable Discord API features)	1m 0s
Test (zlib compression)	43s
Test (zstd compression)	46s
Test (zlib and zstd compression)	56s
Test (chrono, chrono)	1m 8s
Test (unstable API + typesize, default unstable typesize, true)	1m 6s
Test (builder without model, builder, true)	48s
Test (unstable Discord API (no default features), unstable, true)	46s
	23m 7s

Provide feedback