The ornamental design for an outdoorlamp, as shown and described.
1.-2. Outdoor lamp
1.1 is a front perspective view;
1.2 is a front view;
1.3 is a right side view;
1.4 is a left side view;
1.5 is a top plan view;
1.6 is a bottom plan view;
2.1 is a front perspective view;
2.2 is a front view;
2.3 is a right side view;
2.4 is a left side view;
2.5 is a top plan view;
2.6 is a bottom plan view.
The break lines in the drawings indicate that the appearance of any portion of the outdoor between the break lines forms no part of the claimed design.