Install mercurial via pip #1199

Job	Run time
test (macos-latest, 3.7, py)	5m 38s
test (macos-latest, 3.8, py)	9m 4s
test (macos-latest, 3.9, py)	8m 10s
test (macos-latest, 3.10, py)	8m 28s
test (macos-latest, 3.11, py)	6m 43s
test (macos-latest, 3.12, py)	6m 22s
test (macos-latest, pypy-3.7, py)	26m 30s
test (macos-latest, pypy-3.8, py)	17m 10s
test (macos-latest, pypy-3.9, py)	25m 6s
test (macos-latest, pypy-3.10, py)	17m 55s
test (ubuntu-latest, 3.7, py)	2m 32s
test (ubuntu-latest, 3.8, py)	2m 36s
test (ubuntu-latest, 3.9, py)	2m 41s
test (ubuntu-latest, 3.10, py)	2m 31s
test (ubuntu-latest, 3.11, py)	2m 33s
test (ubuntu-latest, 3.12, py)	3m 37s
test (ubuntu-latest, pypy-3.7, py)	10m 47s
test (ubuntu-latest, pypy-3.8, py)	9m 57s
test (ubuntu-latest, pypy-3.9, py)	9m 18s
test (ubuntu-latest, pypy-3.10, py)	8m 52s
test (windows-latest, 3.7, py)	3m 48s
test (windows-latest, 3.8, py)	4m 45s
test (windows-latest, 3.9, py)	4m 15s
test (windows-latest, 3.10, py)	4m 4s
test (windows-latest, 3.11, py)	4m 27s
test (windows-latest, 3.12, py)	6m 10s
test (windows-latest, pypy-3.7, py)	19m 9s
test (windows-latest, pypy-3.8, py)	13m 49s
test (windows-latest, pypy-3.9, py)	15m 27s
test (windows-latest, pypy-3.10, py)	14m 27s
test (3.7, lint, ubuntu-latest)	24s
test (3.7, typing, ubuntu-latest)	36s
test (3.7, py-oldsetup, ubuntu-latest)	2m 32s
	4h 40m 23s

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