Use pallet-contracts-uapi #377

Job	Run time
set-image	1s
clippy	3m 19s
clippy-examples (STD)	10m 30s
check (STD)	8m 20s
dylint	3m 14s
clippy-examples (WASM)	3m 5s
check (WASM)	1m 34s
check (RISCV)	1m 53s
fmt	2m 26s
spellcheck	1m 26s
examples-test	27m 42s
build (STD)	13m 27s
build (WASM)	1m 34s
test	14m 31s
docs	5m 6s
codecov	24m 2s
examples-contract-build (WASM)	16m 35s
examples-contract-build (RISCV)	2m 52s
examples-docs	3m 16s
fuzz	0s
measurements / contract-sizes	25m 19s
	2h 50m 12s

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