Pluginlib Deprecation Fix

[DLu]

Description

Link to the proper pluginlib headers. See this deprecation warning

Checklist

• Required by CI: Code is auto formatted using clang-format

[codecov]

Codecov Report

Merging #542 (062b536) into main (a9849cf) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #542      +/-   ##
==========================================
+ Coverage   46.65%   46.67%   +0.02%     
==========================================
  Files         183      183              
  Lines       19654    19654              
==========================================
+ Hits         9168     9171       +3     
+ Misses      10486    10483       -3     

Impacted Files	Coverage Δ
...dl_kinematics_plugin/src/kdl_kinematics_plugin.cpp	75.85% <0.00%> (+1.14%)	⬆️

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