ERC-721: Clear approval in `burn()` (#2099) #1180

Job	Run time
set-image	1s
dylint	14m 40s
clippy	23m 12s
clippy-examples (STD)	22m 47s
check (STD)	16m 22s
clippy-examples (WASM)	14m 32s
check (WASM)	11m 38s
fmt	11m 57s
spellcheck	10m 40s
check (RISCV)	12m 1s
test (ink)	19m 40s
build (STD)	18m 45s
test (linting)	14m 3s
build (WASM)	11m 40s
examples-custom-test	25m 47s
examples-test (1)	9m 27s
docs	18m 13s
examples-test (2)	14m 59s
examples-test (3)	14m 38s
codecov	23m 4s
examples-test (4)	9m 7s
examples-test (5)	11m 20s
examples-test (6)	9m 17s
examples-contract-build (WASM, 1)	17m 27s
examples-docs	15m 25s
examples-contract-build (WASM, 2)	18m 25s
examples-contract-build (WASM, 3)	19m 38s
examples-contract-build (WASM, 4)	17m 20s
examples-contract-build (RISCV, 1)	12m 56s
fuzz	11m 17s
measurements / contract-sizes	0s
	7h 30m 18s

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