Blender Git Loki

Fix T75845: some dependencies update missing when painting textures.

issue: Painting a texture that is set as a particle system influencer, doesn't
update particles. An external trigger (such as changing influence slider)
is required to update particles.

fix: The root cause is a missing relationship from image to texture in the
dependency graph.

test: Once fixed, image texture painting updates expected dependencies
such as particle system influence or displacement modifier.

Reviewed By: sergey

Maniphest Tasks: T75845

Differential Revision: https://developer.blender.org/D7472