Summary

The latest version of the paketo-buildpacks/poetry buildpack introduced support for the new Poetry major version 2 (see paketo-buildpacks/poetry#473). Integration tests in #1027 are failing due to the Poetry build descriptors in the tests missing or using deprecated configuration options:

[builder] The "poetry.dev-dependencies" section is deprecated and will be removed in a future version. Use "poetry.group.dev.dependencies" instead.
[builder] If you want to use Poetry only for dependency management but not for packaging, you can disable package mode by setting package-mode = false in your pyproject.toml file.

This PR prepares the Poetry build descriptors to be compatible with Poetry version 2.

Note to reviewers: Trying to run the integration tests by simply executing the test script with ./scripts/integration.sh fails if no additional script flags are used. The small change to the scripts/package.sh script deals with that.

Checklist

• I have viewed, signed, and submitted the Contributor License Agreement.
• I have linked issue(s) that this PR should close using keywords or the Github UI (See docs)
• I have added an integration test, if necessary.
• I have reviewed the styleguide for guidance on my code quality.
• I'm happy with the commit history on this PR (I have rebased/squashed as needed).