Bump brace-expansion in /react-nginx

Bumps  and [brace-expansion](https://github.com/juliangruber/brace-expansion). These dependencies needed to be updated together.

Updates `brace-expansion` from 1.1.11 to 1.1.21
- [Release notes](https://github.com/juliangruber/brace-expansion/releases)
- [Commits](https://github.com/juliangruber/brace-expansion/compare/1.1.11...v1.1.21)

Updates `brace-expansion` from 2.0.1 to 2.1.7
- [Release notes](https://github.com/juliangruber/brace-expansion/releases)
- [Commits](https://github.com/juliangruber/brace-expansion/compare/1.1.11...v1.1.21)

---
updated-dependencies:
- dependency-name: brace-expansion
  dependency-version: 1.1.21
  dependency-type: indirect
- dependency-name: brace-expansion
  dependency-version: 2.1.7
  dependency-type: indirect
...

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