fix(aws-cdk-lib): Changing InstanceType regex values to add hyphen

[bibhu107]

This change modifies the regex value of instance types to take hyphen

Closes #.
#27587

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[mergify]

⚠️ The sha of the head commit of this PR conflicts with #27613. Mergify cannot evaluate rules on this PR. ⚠️

[aws-cdk-automation]

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[aws-cdk-automation]

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[mergify]

⚠️ The sha of the head commit of this PR conflicts with #27616. Mergify cannot evaluate rules on this PR. ⚠️

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 484f34b
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