slic3r: 0.9.9 -> 0.9.10b

Bump two perl modules to make the new slic3r build. Tests still fail
though, but with a different error:

 Use of uninitialized value $deg in numeric eq (==) at /tmp/nix-build-perl-slic3r-0.9.10b.drv-0/git-export/t/../lib/Slic3r/TriangleMesh.pm line 328.
 # Looks like your test exited with 255 before it could output anything.

It's like this for all tests.