The ornamental design for a fixingbracket, as shown and described.
1. Fixing bracket
1.1 : Front
1.2 : Left
1.3 : Perspective
1.4 : Perspective
1.5 : Top
1.6 : Perspective
The design in the present application is a new, original, and ornamental design for a fixing bracket, of which the following is a specification, wherein: Figure 1.1 is a front side view; Figure 1.2 is a left view thereof; Figure 1.3 is a left front perspective view thereof; Figure 1.4 is a right rear perspective view thereof; Figure 1.5 is a a top plan view thereof; Figure 1.6 is a left rear perspective view thereof.