[RM] Fix the lock_guard placement - Humble

[saikishor]

Fixes: #1959

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.92%. Comparing base (6a8053e) to head (faf7e21).
Report is 1 commits behind head on humble.

Additional details and impacted files

@@            Coverage Diff             @@
##           humble    #1960      +/-   ##
==========================================
- Coverage   62.92%   62.92%   -0.01%     
==========================================
  Files         109      109              
  Lines       12505    12504       -1     
  Branches     8482     8481       -1     
==========================================
- Hits         7869     7868       -1     
  Misses        852      852              
  Partials     3784     3784              

Flag	Coverage Δ
unittests	62.92% <100.00%> (-0.01%)	⬇️

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Files with missing lines	Coverage Δ
hardware_interface/src/resource_manager.cpp	79.23% <100.00%> (-0.04%)	⬇️