The ornamental design for an upperportion of a vacuum cleaner, as shown and described.
FIG. 1 is a front perspective view of a vacuum cleaner showing our new design;
FIG. 2 is a right side elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof; and,
FIG. 6 is a top plan view thereof.
The broken lines shown in the drawings are included for the purpose of illustrating unclaimed portions of the upper portion of the vacuum cleaner and form no part of the claimed design.