Fix deprecations in ament_index_cpp

[christophfroehlich]

got deprecated on rolling-testing, not synced to main yet

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.76%. Comparing base (375a5db) to head (c7e790c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #145   +/-   ##
=======================================
  Coverage   73.76%   73.76%           
=======================================
  Files          12       12           
  Lines        2649     2649           
  Branches      269      269           
=======================================
  Hits         1954     1954           
  Misses        579      579           
  Partials      116      116           

Flag	Coverage Δ
unittests	73.76% <ø> (ø)

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Files with missing lines	Coverage Δ
...ujoco_ros2_control/src/mujoco_system_interface.cpp	53.64% <ø> (ø)

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[christophfroehlich]

oh, this is a duplicate of #82

[christophfroehlich]

correction, this one is newer and up-to-date with ament/ament_index#112