Pin serenity commit #893

Job	Run time
Clippy	1m 22s
Build docs	3m 42s
Test (MSRV)	2m 21s
Rustfmt	9s
Test (stable)	3m 22s
Test (beta)	3m 18s
Test (nightly)	3m 3s
Test (macOS)	2m 52s
Test (Windows)	7m 58s
Test (no features)	2m 34s
Test (all features + simd_json, cargo test --all-features --features serenity/simd_json --lib --t...	2m 2s
Test (native TLS, cargo test --all-features --features serenity/native_tls_backend --lib --tests ...	1m 54s
	34m 37s

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