feat: add tmp cancun config value #8459

Job	Run time
fmt	20s
clippy	1m 58s
doc tests	5m 36s
forge fmt	2m 34s
build matrices	5s
build tests (ubuntu-latest, x86_64-unknown-linux-gnu)	6m 55s
test unit	47s
test integration (1/3)	8m 8s
test integration (2/3)	5m 22s
test integration (3/3)	6m 6s
test integration/issue-repros (1/2)	2m 54s
test integration/issue-repros (2/2)	2m 44s
test integration/forge-std	3m 33s
test integration/external (1/2)	5m 37s
test integration/external (2/2)	3m 5s
	55m 44s

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