tests: skip tests using sby on pypy-3.11 #3730

Job	Run time
smoke (amaranth-lang/amaranth-soc)	47s
smoke (amaranth-lang/amaranth-stdio)	45s
document	1m 9s
smoke (amaranth-lang/amaranth-boards)	40s
check-links	56s
test (3.8)	2m 33s
test (3.9)	2m 26s
test (pypy-3.9)	6m 12s
test (pypy-3.11)	4m 51s
test (pypy-3.8)	5m 49s
test (3.11)	3m 31s
test (3.13-dev)	2m 59s
test (3.10)	2m 27s
test (3.12)	4m 16s
test (pypy-3.10)	4m 54s
publish-docs	14s
publish-docs-dev	0s
required	2s
publish-schemas	5s
publish-package	31s
publish-release	3s
	45m 10s

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