Don't crash autoupdate on non-PEP440-compliant tool versions #1773

Job	Run time
deploy	35s
test (3.8, lint)	41s
test (3.8, lint_docs)	1m 23s
test (3.8, mypy)	42s
test (3.8, unit-quick)	15m 46s
test (3.8, unit-diagnostic-servebasic-gx-dev)	4m 56s
test (3.8, unit-nonredundant-noclientbuild-noshed-gx-2109)	23m 28s
test (3.8, unit-nonredundant-noclientbuild-noshed-gx-2205)	25m 30s
test (3.8, unit-nonredundant-noclientbuild-noshed-gx-dev)	28m 19s
test (3.8, unit-nonredundant-noclientbuild-noshed-nogx)	55m 20s
test (3.8, unit-diagnostic-serveclientcmd)	14m 19s
test (3.11, lint)	45s
test (3.11, mypy)	44s
test (3.11, unit-quick)	15m 3s
	3h 7m 31s

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