Adjust the Variable types in Nav2_costmap_2d pkg in [nav2_humble]

[GoesM]

#3891

To improve the compatibility of navigation2-[ROS2-humble] with the latest version of the compilation environment , we modify the code in nav2_costmap_2d refer to the ISSUE #3891

[mergify]

@GoesM, all pull requests must be targeted towards the main development branch.
Once merged into main, it is possible to backport to @humble, but it must be in main
to have these changes reflected into new distributions.

[SteveMacenski]

@GoesM please retarget to main and I'll backport once approved. We want the git history to move in one direction.

[mergify]

@GoesM, all pull requests must be targeted towards the main development branch.
Once merged into main, it is possible to backport to @humble, but it must be in main
to have these changes reflected into new distributions.