Bump scijava-common dependency temporarily, just for Windows

Windows is that little bit special, just ever so *slightly* different
enough to require extra work. Like, always.

In this particular instance, the SciJava common TestUtils class needed
to bend over -- just slightly! -- to let the tests do what they need
to do even on Windows.

This ugly hack can be reverted once pom-scijava 2.6 comes out,
referencing a newer scijava-common version. But this developer refuses
to make a new pom-scijava *just* for Windows. Non, monsieur, je refuse!

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>