Use tinyxml2 package instead of deprecated tinyxml2_vendor

[Noel215]

See ros2/tinyxml2_vendor@f2fc760

[saikishor]

Thank you for this ;)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.62%. Comparing base (23337e5) to head (a6ad5e4).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2833      +/-   ##
==========================================
- Coverage   89.64%   89.62%   -0.03%     
==========================================
  Files         152      152              
  Lines       17815    17816       +1     
  Branches     1455     1455              
==========================================
- Hits        15971    15967       -4     
- Misses       1260     1263       +3     
- Partials      584      586       +2     

Flag	Coverage Δ
unittests	89.62% <ø> (-0.03%)	⬇️

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see 2 files with indirect coverage changes

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[christophfroehlich]

Thanks!