chore: use published version of cdk-assets

[TheRealAmazonKendra]

This change reflects the move of cdk-assets from the monorep to a standalone library.

The build also pulled in some unrelated changes to the THIRD_PARTY_LICENSES files. This is to be expected.

Checklist

• [ ] My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[TheRealAmazonKendra]

I still need to add some README updates so I've added the do-not-merge label on this.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 4f1fe4919168e2564eb9d7fd6c1347836964ef56
• Result: SUCCEEDED
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