Update source repository to fork for i2rt description

Closes #183

Author: stephane-caron

robot_descriptions/_repositories.py

@@ -156,7 +156,7 @@ class Repository:
         cache_path="halodi-robot-models",
     ),
     "i2rt": Repository(
-        url="https://github.com/i2rt-robotics/i2rt.git",
+        url="https://github.com/robot-descriptions/i2rt.git",
         commit="7809b5b17227162d265f922e2e10598c0e214322",
         cache_path="i2rt",
     ),