There is no quick option to invert depth data vertically yet. But you can manually change the code to do it:
Open ReShade.fx and change the following line:
float depth = tex2D(RFX_depthColor, texcoord).x;
to this:
float depth = tex2D(RFX_depthColor, float2(texcoord.x, 1.0 - texcoord.y)).x;