fix: add dependency ts-morph for Signals Input migrator

[rainerhahnekamp]

Add ts-morph as a dependency, which is needed for the Signals Input migrator.

[nartc]

Thanks for the PR. Not sure why I missed this. Even ng-packagr was updated to have ts-morph x.x

@all-contributors please add @rainerhahnekamp for code

[allcontributors]

@nartc

I couldn't determine any contributions to add, did you specify any contributions?
Please make sure to use valid contribution names.

I've put up a pull request to add @rainerhahnekamp! 🎉

[nx-cloud]

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