Add support for python3.14 runtime

[snapoleonbetclic]

Pull Request Checklist

For New Runtime Additions

• [x] Added the new runtime to the manifest.json file
• [x] Updated README.md to reflect the new runtime
• [x] Gave execution permission to build.sh
• [ ] If needed, updated .github/dependabot.yml
• [ ] If needed, updated .gitignore

Description

Add support for python3.14 runtime https://aws.amazon.com/fr/about-aws/whats-new/2025/11/aws-lambda-python-314/

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[snapoleonbetclic]

Hello @maxday, do I have to do something to fix the credentials issue in the test here ?