fix(autoware_tensorrt_yolox): fix variableScope

[Nagi70]

Description

This is a fix based on cppcheck variableScope warnings

perception/autoware_tensorrt_yolox/src/tensorrt_yolox.cpp:775:24: style: The scope of the variable 'masks' can be reduced. [variableScope]
std::vectorcv::Mat masks;
^
perception/autoware_tensorrt_yolox/src/tensorrt_yolox.cpp:776:24: style: The scope of the variable 'color_masks' can be reduced. [variableScope]
std::vectorcv::Mat color_masks;
^

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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 23.72%. Comparing base (7382d66) to head (dd5668e).
Report is 30 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8430      +/-   ##
==========================================
- Coverage   23.85%   23.72%   -0.14%     
==========================================
  Files        1379     1379              
  Lines      101614   101409     -205     
  Branches    38634    38520     -114     
==========================================
- Hits        24244    24055     -189     
- Misses      74861    74965     +104     
+ Partials     2509     2389     -120     

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	23.76% <ø> (-0.10%)	⬇️	Carriedforward from 8c5a24b

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[Shin-kyoto]

LGTM

• I confirmed that this PR's content is good to merge.
• I did NOT check this PR by running autoware.

@manato @dan-dnn
I think these changes are good to merge. How do you think about this PR?

[dan-dnn]

LGTM