Bump k256 from 0.13.3 to 0.13.4 #1370

Job	Run time
preflight / preflight	46s
cargo-check-benches (master)	25m 12s
test-frame-ui	36m 17s
cargo-check-benches (current)	30m 50s
test-full-crypto-feature	2m 27s
cargo-check-all-crate-macos	11m 8s
cargo-check-each-crate (1)	44m 46s
test-node-metrics	13m 53s
cargo-check-each-crate (2)	42m 48s
cargo-check-each-crate (3)	16m 3s
cargo-check-each-crate (4)	43m 24s
cargo-check-each-crate (5)	49m 7s
cargo-check-each-crate (6)	30m 6s
cargo-check-each-crate (7)	50m 37s
test-frame-examples-compile-to-wasm	2m 52s
test-deterministic-wasm	10m 15s
check-tracing	2m 10s
check-metadata-hash	7m 44s
cargo-hfuzz	7m 2s
node-bench-regression-guard	12s
All test misc tests passed	1s
	7h 7m 40s

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