docs: Add missing package to Attribution.txt

If your build fails due to your commit message not passing the build checks, please review the guidelines here: https://github.com/edgexfoundry/app-functions-sdk-go/blob/main/.github/CONTRIBUTING.md

PR Checklist

Please check if your PR fulfills the following requirements:

[x] I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
[x] I am not introducing a new dependency (add notes below if you are)
[ ] I have added unit tests for the new feature or bug fix (if not, why?) N/A
[ ] I have fully tested (add details below) this the new feature or bug fix (if not, why?) N/A
[ ] I have opened a PR for the related docs change (if not, why?) N/A