chore: Adjust server-less tooling for the new AWS Lambda "provided" run-times

[zatlodan]

What this PR does:

The "old" go1.x runtime is being deprecated.

Changes the CMD server-less build tooling to be compatible with the "new" AWS lambda run-times by default.

The "new" GoLang compatible AWS Lambda run-times expect an executable with the name bootstrap to be provided.
The handler configuration is ignored when using the "new" runtime.

See https://aws.amazon.com/blogs/compute/migrating-aws-lambda-functions-from-the-go1-x-runtime-to-the-custom-runtime-on-amazon-linux-2/ for more info.

Checklist

• Tests updated
• Documentation added
• CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]

[CLAassistant]

All committers have signed the CLA.

[mapno]

LGMT. Can you add a changelog entry specifying what's being deprecated? Thanks!

[zatlodan]

LGMT. Can you add a changelog entry specifying what's being deprecated? Thanks!

Thank you, and sorry for the late response.

I've added a changelog entry.
Since this change only affects the build tooling, I didn't mark it as a breaking change,
although it might require adjustments for users relying on the previous build process.

Please let me know if any further adjustments are needed.

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[mapno]

I'd like to be a bit more explicit with the migration.

[zatlodan]

I'd like to be a bit more explicit with the migration.

I agree, it is better to be more explicit here.
I was initially not sure if I should mark it as a breaking change, as I am not used to writing change-logs.

[zatlodan]

@mapno Can we get an update on this?

[mapno]

LGTM, thanks for the contribution