Don't include setup.py hash in cache key #326

Job	Run time
static	1m 1s
test (docs)	1m 13s
test (examples)	2m 46s
test (test, test local var val, --test-arg --test-arg)	1m 3s
test (remote, 0)	3m 21s
test (remote-test, remote-test, 1)	2m 51s
test (test-coverage, test local var val, --test-arg, test-coverage)	1m 31s
test (test-coverage, test local var val, --test-arg, 3.8, ubuntu-20.04, test-coverage-oldest)	1m 16s
test (test-nengo, test local var val, --test-arg, 3.11)	1m 33s
auto-update	0s
deploy	0s
coverage	27s
	17m 2s

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