Tasks use deprecated Node.js 16 runtime in Azure DevOps

[daniel-barda-cobwebs]

When running Octopus Deploy tasks in Azure DevOps pipelines, we are seeing warnings indicating that the tasks depend on Node.js version 16, which has reached end-of-life. Azure DevOps has deprecated Node 16 and is migrating to Node 20 for all task runners.

Example warnings:

##[warning]Task 'Deploy Octopus Release to Tenants' version 6 (OctopusDeployReleaseTenanted@6) is dependent on a Node version (16) that is end-of-life. Contact the extension owner for an updated version of the task. Task maintainers should review Node upgrade guidance: https://aka.ms/node-runner-guidance

##[warning]Task 'Await Octopus Task Completion' version 6 (OctopusAwaitTask@6) is dependent on a Node version (16) that is end-of-life. Contact the extension owner for an updated version of the task. Task maintainers should review Node upgrade guidance: https://aka.ms/node-runner-guidance

Would appreciate an update to support Node 20. Thanks!