requirements: update sphinx-autodoc-typehints requirement from <1.16.0 to <2.6.0 #9531

Job	Run time
build (3.7, x64, ubuntu)	52m 44s
build (3.7, x64, windows)	49m 20s
build (3.11, x64, ubuntu)	1h 16m 40s
build (3.11, x64, macos)	30m 9s
build (3.11, x64, windows)	1h 20m 4s
build (3.12, x64, ubuntu)	1h 16m 21s
build (3.12, x64, macos)	26m 31s
build (3.12, x64, windows)	1h 19m 23s
build (3.9, macos, --cov=psyneulink)	38m 4s
build (3.9, ubuntu, --forked -m "not llvm")	32m 14s
build (3.8, x86, windows)	1h 23m 3s
build (3.10, ubuntu, --fp-precision=fp32)	1h 18m 38s
build (3.10, macos, -m benchmark --benchmark-enable --benchmark-only --benchmark-min-rounds=2 --b...	21m 43s
build (3.7, x64, ubuntu, min)	1h 4m 51s
build (3.8, macos)	29m 33s
	13h 39m 18s

Provide feedback