Bumped minimum acceptable tito version
Bumped minimum acceptable tito version

Refactors to the custom tito builder and tagger require a newer version
of `tito` than before. Any version after 26219ab contain all of the
refactoring in `tito` that is necessary to support the new Origin custom
tagger and builder.

Signed-off-by: Steve Kuznetsov <a7da0fca91d9933d2725d731a48cabdc9e8ffd7a@redhat.com>

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