Calling GetLastDataRow/Pos() with MAXROW as the last row is apparently
fine, but if that's an invalid row, but anything beyond that is not ok.
ScDependantsCalculator::trimLength() may use such larger "last" row
value because it works on a range of cells.

Change-Id: I819a4d20a4765e23af6208df5f2e208ac44b694c
Reviewed-on: https://gerrit.libreoffice.org/68349
Tested-by: Jenkins
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>
(cherry picked from commit beba45a5)
Reviewed-on: https://gerrit.libreoffice.org/68512