tests: skip tests using sby on pypy-3.11 #3725

Job	Run time
smoke (amaranth-lang/amaranth-stdio)	52s
check-links	53s
smoke (amaranth-lang/amaranth-boards)	35s
smoke (amaranth-lang/amaranth-soc)	1m 0s
document	55s
test (3.9)	2m 33s
test (3.11)	3m 26s
test (3.10)	2m 26s
test (3.12)	3m 41s
test (pypy-3.10)	4m 42s
test (pypy-3.9)	5m 16s
test (3.14-dev)	35s
test (3.13)	3m 11s
test (pypy-3.11)	5m 45s
publish-docs	21s
publish-docs-dev	0s
required	3s
publish-package	34s
publish-schemas	16s
publish-release	0s
	37m 4s

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