Avoid C++20 structured binding capture (backport #2832)

[mergify]

Remove the -Wc++20-extensions warning triggered by capturing a structured binding in a lambda.

ROS 2 still targets C++17 only (REP-2000). Capturing structured bindings directly is a C++20 extension, so we avoid it by using .second explicitly instead. The unused first element (hw_name / entry.first) is omitted to avoid the separate -Wunused-variable warning/error.

No functional change.

Fixes #2574

Tested locally:

• colcon build --packages-select hardware_interface
• colcon test --packages-select hardware_interface - all tests pass

  ---

  This is an automatic backport of pull request hardware_interface: fix C++20 structured-binding capture in lambda (fixes #2574) #2832 done by Mergify.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.50%. Comparing base (1abab95) to head (7d4301c).
⚠️ Report is 4 commits behind head on jazzy.

Files with missing lines	Patch %	Lines
hardware_interface/src/resource_manager.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            jazzy    #2834      +/-   ##
==========================================
+ Coverage   89.48%   89.50%   +0.01%     
==========================================
  Files         152      152              
  Lines       17704    17747      +43     
  Branches     1453     1448       -5     
==========================================
+ Hits        15842    15884      +42     
- Misses       1282     1287       +5     
+ Partials      580      576       -4     

Flag	Coverage Δ
unittests	89.50% <0.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
hardware_interface/src/resource_manager.cpp	75.93% <0.00%> (-0.07%)	⬇️

... and 2 files with indirect coverage changes

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