The ornamental design for a publiclightingfixture, as shown and described.
1. Public lighting fixture
1.1 is a Perspective view of a public lighting fixture showing my new design;
1.2 is a front elevation view thereof;
1.3 is a rear elevation view thereof;
1.4 is a right side elevation view thereof;
1.5 is a left side elevation view thereof;
1.6 is a top plan view thereof; and
1.7 is a bottom plan view thereof.
The dash-dot-dash broken lines shown represent the bounds of the claim and forms no part thereof and the dashed broken lines shown therein illustrate portions of the lighting fixture that form no part of the claimed design.