Bisection should not produce zero-length commit ranges

[andrewpollock]

Describe the bug #1984 surfaced that the bisection performed for OSS-Fuzz sometimes produces a zero-length range, which is invalid See the list of records at https://github.com/google/osv.dev/issues/1984#issuecomment-2060518658

Expected behaviour Such ranges should not be produced.

[andrewpollock]

https://github.com/google/osv.dev/blob/master/docker/worker/oss_fuzz.py is where the action is

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