squash! Use scijava-common 2.7.1-SNAPSHOT specifically.

Now that pom-fiji references a newer pom-scijava which references
scijava-common 2.8.0, we do not need that commit anymore (you might need
to force snapshot updates to make this work if you try it within 24 hours
of the latest pom-fiji change).

Revert "Use scijava-common 2.7.1-SNAPSHOT specifically."

This reverts commit 0107cb50a1a29b4be3ed906d9d08169c31b75000.