Drop support for python 3.7 #9955

Job	Run time
build (3.8, x64, ubuntu)	1h 23m 48s
build (3.8, x64, windows)	1h 27m 0s
build (3.11, x64, ubuntu)	1h 23m 29s
build (3.11, x64, macos)	27m 15s
build (3.11, x64, windows)	1h 26m 24s
build (3.12, x64, ubuntu)	1h 21m 42s
build (3.12, x64, macos)	34m 42s
build (3.12, x64, windows)	1h 22m 44s
build (3.9, macos, --cov=psyneulink)	50m 27s
build (3.9, ubuntu, --forked -m "not llvm")	34m 58s
build (3.9, x86, windows)	1h 31m 21s
build (3.10, ubuntu, --fp-precision=fp32)	1h 23m 57s
build (3.10, macos, -m benchmark --benchmark-enable --benchmark-only --benchmark-min-rounds=2 --b...	29m 42s
build (3.8, macos, min)	31m 55s
	14h 49m 24s

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