chore(slack): migrate from slack to @slack/bolt in functions/billing example

[hivanalejandro]

Description

Fixes b/414422540

Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Please merge this PR for me once it is approved

[gemini-code-assist]

Hello @hivanalejandro, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

Summary of Changes

This pull request migrates the billing example from the deprecated slack package to @slack/bolt. This involves updating the package.json file to remove the old dependency and add the new one.

Highlights

• Dependency Migration: The pull request migrates from the deprecated slack package to the actively maintained @slack/bolt package for Slack integration.
• Package Updates: The package.json file is updated to reflect the change in Slack dependency, removing slack and adding @slack/bolt.

Changelog

• functions/billing/package.json
  • Replaced the slack dependency with @slack/bolt.
  • Removed the deprecated slack package version 11.0.1.
  • Added the @slack/bolt package version 4.2.1.

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A package replaced,
Old Slack finds its rest,
Bolt shines anew now.

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[gemini-code-assist]

Code Review

The pull request migrates the billing example from the deprecated slack package to @slack/bolt. This is a good move to keep the project up-to-date with current libraries. The changes seem straightforward, but let's review them to ensure everything is in order.

Merge Readiness

The pull request appears to be a straightforward migration to a newer Slack library. Given the limited scope of the changes and the presence of tests, it seems reasonable to merge after addressing the identified issues. I am unable to directly approve the pull request, and recommend that others review and approve this code before merging.