(aws-ssm): Using a number token for version number on StringParameter.fromStringParameterAttributes does not resolve properly

[john-kontralto]

If you provide a number token to StringParameter.fromStringParameterAttributes, you end up with a random literal in the template instead of a Ref

Reproduction Steps

const paramVersion = new CfnParameter(this, `VersionParameter`, {
  type: 'Number',
}).valueAsNumber;

StringParameter.fromStringParameterAttributes(this, `SsmParamId`, {
  parameterName: 'something',
  version: paramVersion,
}).stringValue;

What did you expect to happen?

The parameter version would resolve properly as a Ref in the template

What actually happened?

You get a literal value in the template like "-1.888154589708849e+289"

Environment

• CDK CLI Version : 1.75.0 (build 7708242)
• Framework Version: 1.75.0
• Node.js Version: v12.16.2
• OS : OS X 10.14.6
• Language (Version): TypeScript 3.9.7

Other

Related to #11813

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This is 🐛 Bug Report

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