[Changelog] Add changelog for computenode bootstrap timeout detection fix in protected mode

[hehe7318]

Description of changes

• Add changelog for computenode bootstrap timeout detection fix in protected mode

References

• [Bug Fix] Fix clustermgtd to detect bootstrap timeout so protected mode can trigger aws-parallelcluster-node#702

Checklist

• Make sure you are pointing to the right branch.
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• Check if documentation is impacted by this change.

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