fix(lambda-python): handler path is incorrectly generated when using PythonFunction

[sarisia]

When using PythonFunction, current implementation generates handler value incorrectly.

Code

new PythonFunction(stack, 'handler', {
    entry: 'test/lambda-handler-sub-nested',
    index: 'inner/inner2/custom_index.py',
    handler: 'custom_handler',
    runtime: Runtime.PYTHON_3_8,
});

Expected

Handler: inner.inner2.custom_index.custom_handler

Current Behaviour

Handler: inner.inner2/custom_index.custom_handler

This PR fix the issue by modifying string replace pattern.

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[gitpod-io]

[TheRealAmazonKendra]

Does this change have an issue associated with it? If so, please add it to the description.

[sarisia]

Does this change have an issue associated with it? If so, please add it to the description.

We don’t have an open issue.

[TheRealAmazonKendra]

Thank you for your contribution!

[mergify]

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[sarisia]

@Mergifyio refresh

[mergify]

refresh

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[mergify]

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildProject89A8053A-LhjRyN9kxr8o
• Commit ID: 332cc7e
• Result: SUCCEEDED
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