feat(repos): update autoware.repos nebula driver version (#6128)

update autoware.repos nebula driver version

update nebula driver version to implement new radar message

Signed-off-by: Taekjin LEE <taekjin.lee@tier4.jp>

Author: technolojin

autoware.repos

@@ -100,7 +100,7 @@ repositories:
   sensor_component/external/nebula:
     type: git
     url: https://github.com/tier4/nebula.git
-    version: v0.2.4
+    version: v0.2.6
   # Fork of transport_drivers that enables reduction of copy operations
   sensor_component/transport_drivers:
     type: git