The package is severely out of date with respect to the Debian
Policy. Latest version is 4.6.2
and your package only follows
3.9.4...
The package has a debian/watch file, but the last attempt
to use it for checking for newer upstream versions failed with
an error:
In debian/watch no matching files for watch line http://forge.scilab.org/index.php/p/flexdock/downloads/direct/ .*/flexdock-([\d\.]*).tar.gz debian debian/orig-tar.sh