chore(cdk): increase coverage limits

[mrgrain]

Issue

Relates to #31931

Reason for this change

The AWS CLI currently requires comparatively low coverage by tests:

statements: 60
branches: 45

The actual coverage is thankfully higher:

=============================== Coverage summary ===============================
Statements   : 81.59% ( 5462/6694 )
Branches     : 68.05% ( 1764/2592 )
Functions    : 84.49% ( 1128/1335 )
Lines        : 81.9% ( 5211/6362 )
================================================================================

Make sure we don't drop below the current values.

Checklist

• [x] 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

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 2a78c1b082e7bc8b213ba3d5a78bdf6898caffb4
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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