Upgrade black to 26.5.0 #15365

Job	Run time
stubtest: stdlib (ubuntu-latest, 3.14)	39s
stubtest: stdlib (ubuntu-latest, 3.11)	36s
stubtest: stdlib (ubuntu-latest, 3.12)	35s
stubtest: stdlib (windows-latest, 3.12)	1m 0s
stubtest: stdlib (windows-latest, 3.11)	1m 18s
stubtest: stdlib (windows-latest, 3.15)	2m 4s
stubtest: stdlib (macos-latest, 3.13)	32s
stubtest: stdlib (windows-latest, 3.14)	2m 33s
stubtest: stdlib (macos-latest, 3.10)	46s
stubtest: stdlib (ubuntu-latest, 3.15)	49s
stubtest: stdlib (ubuntu-latest, 3.13)	34s
stubtest: stdlib (ubuntu-latest, 3.10)	39s
stubtest: stdlib (macos-latest, 3.12)	25s
stubtest: stdlib (macos-latest, 3.14)	1m 2s
stubtest: stdlib (windows-latest, 3.13)	1m 7s
stubtest: stdlib (macos-latest, 3.15)	46s
stubtest: stdlib (macos-latest, 3.11)	25s
	15m 50s

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