The ornamental design for equestrian conejumpcup, as shown and described.
FIG. 1 is a perspective view of an equestrian cone jump cup of the present invention, the broken lines showing a supporting cone and a jump pole for illustrative purposes only and forming no part of the claimed design;
FIG. 2 is a front elevational view of the invention, the rear elevational view of the invention being a mirror image thereof;
FIG. 3 is a left-side elevational view of the invention, the right-side elevational view being a mirror image thereof;