Bump form-data in /scripts/gcb2slack in the npm_and_yarn group (#3797)

Bumps the npm_and_yarn group in /scripts/gcb2slack with 1 update: [form-data](https://github.com/form-data/form-data).


Updates `form-data` from 4.0.2 to 4.0.4
- [Release notes](https://github.com/form-data/form-data/releases)
- [Changelog](https://github.com/form-data/form-data/blob/master/CHANGELOG.md)
- [Commits](form-data/form-data@v4.0.2...v4.0.4)

---
updated-dependencies:
- dependency-name: form-data
  dependency-version: 4.0.4
  dependency-type: indirect
  dependency-group: npm_and_yarn
...

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Author: dependabot[bot]