fix(lane_change): do not use reference values of polygon outer

[rej55]

Description

Do not use reference values of polygon outer.

Related links

Tests performed

planning simulator

Notes for reviewers

Interface changes

Not applicable.

Effects on system behavior

Not applicable.

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[kosuke55]

LGTM

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (5725c2d) 14.80% compared to head (130769d) 14.80%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5318   +/-   ##
=======================================
  Coverage   14.80%   14.80%           
=======================================
  Files        1665     1665           
  Lines      115286   115286           
  Branches    35600    35604    +4     
=======================================
  Hits        17068    17068           
  Misses      78958    78958           
  Partials    19260    19260           

Flag	Coverage Δ		*Carryforward flag
differential	12.52% <20.00%> (?)
total	14.80% <ø> (-0.01%)	⬇️	Carriedforward from 5725c2d

*This pull request uses carry forward flags. Click here to find out more.

Files	Coverage Δ
...th_planner/src/scene_module/lane_change/normal.cpp	3.92% <0.00%> (ø)
...ner/src/utils/path_safety_checker/safety_check.cpp	21.96% <33.33%> (ø)

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