The ornamental design for a pitcher, as shown and described.
FIG. 1 is a front perspective view of our pitcher.
FIG. 2 is a back perspective view thereof.
FIG. 3 is a front view thereof.
FIG. 4 is a back view thereof.
FIG. 5 is a right side view thereof.
FIG. 6 is a left side view thereof.
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The dash-dot lines in FIGS. 1, 7, and 8 depict boundary lines and form no part of the claimed design. The areas within the boundary lines form no part of the claimed design. The broken lines illustrate portions of the pitcher that form no part of the claimed design.