The ornamental design for a bottleneck, as shown and described.
FIG. 1 is a front view of a bottle neck of the present invention;
FIG. 2 is a rear view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is an enlarged front view of the neck portion taken along line 4-4 of FIG. 1;
FIG. 5 is an enlarged rear view thereof;
FIG. 6 is an enlarged top view thereof; and
FIG. 7 is an enlarged bottom view thereof.
The broken lines in the Figures show environmental context for illustrative purposes and the peripheral boundary of the claimed design only and form no part of the claimed design.