back/vendor: s/ilang/rtlil as a result of YosysHQ/yosys#4704 #3602

Job	Run time
document	48s
check-links	49s
test (3.9)	2m 15s
smoke (amaranth-lang/amaranth-boards)	41s
test (3.10)	2m 22s
smoke (amaranth-lang/amaranth-stdio)	56s
test (3.11)	2m 48s
smoke (amaranth-lang/amaranth-soc)	1m 1s
test (3.12)	3m 22s
test (3.13)	3m 0s
test (pypy-3.9)	5m 52s
test (pypy-3.10)	4m 43s
test (3.14-dev)	1m 43s
publish-docs	6s
publish-docs-dev	0s
required	1s
publish-package	30s
publish-schemas	8s
publish-release	0s
	31m 5s

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