fix(amplify-graphql-types-generator): use zen-observable-ts

[frederikprijck]

Issue #, if available:
#4419

Description of changes:
As of 3.0.13, aws-amplify is using zen-onservable-ts. (See: aws-amplify/amplify-js@49d295e)

While upgrading our project, which was using aws-amplify 2.x.x, our TypeScript failed to compile.

As soon as I make the changes that are part of this PR, to thé API service generated by thé CLI, TypeScript compilation is succesfull again.

This PR is a first draft for further discussing. I can update the PR accordingly.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[nikhname]

LGTM, thanks for submitting a PR!

[WeMakeLive]

@Seb6277 can this be merged into master?

[frederikprijck]

@WeMakeLive Last information I got, this should be merged into master pretty soon.

@nikhname Would merging this be followed by a new release soon? I've patched our local instance, but would be nice if I can rollback our patch and update to the latest CLI to get rid of the bug.

[renebrandel]

merged! Thanks for the contrib!

[WeMakeLive]

@nikhname - as per @frederikprijck comment - what is the plan for this to be released?

[nikhname]

@frederikprijck @WeMakeLive these changes are available with the latest release - CLI version 4.21.2 :)

[github-actions]

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