Use dev vtk on devdeps (#224)

Author: Cadair

tox.ini

@@ -35,12 +35,13 @@ pass_env =
 set_env =
     PYVISTA_OFF_SCREEN = True
     MPLBACKEND = agg
-    devdeps: PIP_EXTRA_INDEX_URL = https://pypi.anaconda.org/astropy/simple https://pypi.anaconda.org/scientific-python-nightly-wheels/simple https://pypi.anaconda.org/liberfa/simple
+    devdeps: PIP_EXTRA_INDEX_URL = https://pypi.anaconda.org/astropy/simple https://pypi.anaconda.org/scientific-python-nightly-wheels/simple https://pypi.anaconda.org/liberfa/simple https://gitlab.kitware.com/api/v4/projects/13/packages/pypi/simple
 deps =
     # devdeps is intended to be used to install the latest developer version of key dependencies.
     # For packages which publish nightly wheels this will pull the latest nightly
     devdeps: astropy>=0.0.dev0
     devdeps: sunpy>=0.0.dev0
+    devdeps: vtk>=0.0.dev0
     # Packages without nightly wheels will be built from source like this
     devdeps: git+https://github.com/pyvista/pyvista.git
     # Handle minimum dependencies via minimum_dependencies