Use pallet-contracts-uapi #266

Job	Run time
set-image	1s
clippy-examples (STD)	10m 57s
dylint	2m 42s
clippy	2m 39s
clippy-examples (WASM)	3m 32s
check (STD)	8m 17s
check (WASM)	1m 31s
check (RISCV)	1m 40s
fmt	3m 23s
spellcheck	1m 24s
examples-test	23m 23s
build (STD)	13m 23s
test	14m 41s
build (WASM)	1m 23s
docs	0s
codecov	0s
examples-docs	3m 36s
examples-contract-build (WASM)	14m 44s
examples-contract-build (RISCV)	3m 21s
fuzz	1s
measurements	1s
	1h 50m 39s

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