The ornamental design for a starryskyprojectorlamp, as shown and described.
FIG. 1 is a first perspective view of a starry sky projector lamp showing my new design;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines immediately adjacent to the claim and contain inner broken lines depict the bounds of the claimed design, while all other broken lines depict portions of the starry sky projector lamp in which the design is embodied that form no part of the claimed design.