[submodule-sync: submodules/stout] Update submodule to its latest version

[reboot-dev-bot]

Automated update of our submodules to their latest version, by the submodules-sync workflow.

[aviator-app[bot]]

Current Aviator status

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This PR was closed without merging. If you still want to merge this PR, re-open it.

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[aviator-app[bot]]

Branch up-to-date, waiting for checks.

[aviator-app[bot]]

This pull request failed to merge: some CI status(es) failed. Remove the mergequeue-failed label to re-queue.

Failed CI(s): Build and Test (ubuntu-latest, sudo, dazel, --config=asan)

[aviator-app[bot]]

Branch up-to-date, waiting for checks.

[aviator-app[bot]]

Branch up-to-date, waiting for checks.

[aviator-app[bot]]

Branch up-to-date, waiting for checks.

[aviator-app[bot]]

Branch up-to-date, waiting for checks.

[aviator-app[bot]]

Branch up-to-date, waiting for checks.

[aviator-app[bot]]

This pull request failed to merge: queue label was manually removed. Remove the mergequeue-failed label to re-queue.

[aviator-app[bot]]

Branch up-to-date, waiting for checks.

[aviator-app[bot]]

This pull request failed to merge: PR cannot be automatically rebased, please rebase manually to continue. Remove the mergequeue-failed label to re-queue.

Additional debug info: Failed to rebase this PR onto the latest changes from the base branch. You will probably need to rebase this PR manually and resolve conflicts).

[aviator-app[bot]]

Branch up-to-date, waiting for checks.