tests: skip tests using sby on pypy-3.11 #3724

Job	Run time
document	55s
smoke (amaranth-lang/amaranth-soc)	58s
check-links	58s
smoke (amaranth-lang/amaranth-boards)	41s
smoke (amaranth-lang/amaranth-stdio)	55s
test (3.11)	2m 46s
test (3.12)	4m 25s
test (3.10)	3m 4s
test (3.9)	2m 29s
test (pypy-3.9)	4m 46s
test (3.13)	2m 55s
test (3.14-dev)	33s
test (pypy-3.10)	6m 23s
test (pypy-3.11)	5m 40s
publish-docs	5s
publish-docs-dev	0s
required	4s
publish-schemas	7s
publish-package	13s
publish-release	0s
	37m 57s

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