The ornamental design for a foot pedal, as shown and described.
FIG. 1 is a front right side perspective view of a foot pedal in accordance with the new design;
FIG. 2 is a right side isometric view thereof;
FIG. 3 is a left side isometric view thereof;
FIG. 4 is a front isometric view thereof;
FIG. 5 is a rear isometric view thereof;
FIG. 6 is a top isometric view thereof; and,
FIG. 7 is a bottom isometric view thereof.
The broken lines immediately adjacent the shaded areas in FIG. 7 represent the bounds of the claimed design, with the lines themselves and areas within them forming no part of the claimed design.