feat(rds): support 8.0.40 engine version for RDS for MySQL

[mazyu36]

Support new minor version

• Ref: Amazon RDS for MySQL supports new minor version 8.0.40
  

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.19%. Comparing base (d1b3c81) to head (10beb80).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #32117   +/-   ##
=======================================
  Coverage   77.19%   77.19%           
=======================================
  Files         105      105           
  Lines        7164     7164           
  Branches     1311     1311           
=======================================
  Hits         5530     5530           
  Misses       1454     1454           
  Partials      180      180           

Flag	Coverage Δ
suite.unit	77.19% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	77.19% <ø> (ø)

[xazhao]

The change looks good to me.

One small thing: althoug the change is tiny, it's still a new feature for CDK customers we should use feat in the PR title. It will be highlighted in the release note as well.

[aws-cdk-automation]

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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 10beb80
• Result: SUCCEEDED
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