Bump minimatch from 3.0.4 to 3.1.5 in /react-express-mongodb/backend

Bumps [minimatch](https://github.com/isaacs/minimatch) from 3.0.4 to 3.1.5.
- [Changelog](https://github.com/isaacs/minimatch/blob/main/changelog.md)
- [Commits](https://github.com/isaacs/minimatch/compare/v3.0.4...v3.1.5)

---
updated-dependencies:
- dependency-name: minimatch
  dependency-version: 3.1.5
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>