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I don't know that this needs "a solution", but doubt
anything relevant is going to change in Python regardless --
that utcoffset() must return a whole number of minutes has
been documented from the start, and in several years hasn't
caused anyone else a problem.

Do you really believe that Helsinki was once 99 minutes and
52 seconds off from UTC?  I don't ;-)  Seems more likely
that your installation's time zone info is corrupt; that
this specific piece of historical time zone info is wrong
but nobody noticed before ("historical" because it's
certainly not the case that Helsinki is ever 5992 seconds
off from UTC in current reality); or that `dateutil` has a
relevant error.