fix(tracking_object_merger): fix shadowVariable

[kobayu858]

Description

This is a fix based on cppcheck shadowVariable warnings

perception/tracking_object_merger/src/association/solver/successive_shortest_path.cpp:331:14: style: Local variable 'v' shadows outer variable [shadowVariable]
    for (int v = 0; v < n_nodes; ++v) {
             ^

Related links

Parent Issue:

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How was this PR tested?

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.76%. Comparing base (a39cfb7) to head (66f3896).
Report is 16 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7948   +/-   ##
=======================================
  Coverage   28.75%   28.76%           
=======================================
  Files        1594     1594           
  Lines      116892   116852   -40     
  Branches    50050    50050           
=======================================
- Hits        33616    33615    -1     
+ Misses      74178    74139   -39     
  Partials     9098     9098           

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	28.76% <ø> (+0.01%)	⬆️	Carriedforward from a39cfb7

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[technolojin]

LGTM

[yukkysaito]

LGTM