Bump minimist from 1.2.0 to 1.2.7 in /scripts/gcb2slack (#2864)

Bumps [minimist](https://github.com/minimistjs/minimist) from 1.2.0 to 1.2.7.
- [Release notes](https://github.com/minimistjs/minimist/releases)
- [Changelog](https://github.com/minimistjs/minimist/blob/main/CHANGELOG.md)
- [Commits](minimistjs/minimist@v1.2.0...v1.2.7)

---
updated-dependencies:
- dependency-name: minimist
  dependency-type: indirect
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>