Use std_atomic<bool> in SJTC (backport #1385)

[mergify]

The upstream API changed, so we have to follow.

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This is an automatic backport of pull request #1385 done by Mergify.

[mergify]

Cherry-pick of 6a3be3f has failed:

On branch mergify/bp/humble/pr-1385
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	both modified:   ur_controllers/src/scaled_joint_trajectory_controller.cpp

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[christophfroehlich]

I merged this upstream in ros2_controllers now.

[christophebedard]

I think a new Humble release (with this fix) is needed. The ur_controllers Hbin job is currently failing: https://build.ros2.org/view/Hbin_uJ64/job/Hbin_uJ64__ur_controllers__ubuntu_jammy_amd64__binary/251/console.

I plan to sync Humble in the next few days.

[urfeex]

I think a new Humble release (with this fix) is needed. The ur_controllers Hbin job is currently failing: https://build.ros2.org/view/Hbin_uJ64/job/Hbin_uJ64__ur_controllers__ubuntu_jammy_amd64__binary/251/console.

I plan to sync Humble in the next few days.

I was waiting for that to happen before releasing a new package. Will do that rightaway.