corrects memorysize cloudformation type for lambda

[VicFrolov]

The type for MemorySize should be Int, but it is shown as a string

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-lambda-function.html

Issue #, if available:

Description of changes:

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[josefaidt]

Hey @VicFrolov :wave: great catch and thank you for the PR!

[siegerts]

Hi @VicFrolov, do you want to commit the suggestions above and we can get this merged in. Thanks!

[VicFrolov]

@siegerts sure thing!