Bump the devcenter-generator-dependencies group (#676)

Bumps the devcenter-generator-dependencies group in /support/devcenter with 2 updates: [guzzlehttp/guzzle](https://github.com/guzzle/guzzle) and [twig/twig](https://github.com/twigphp/Twig).


Updates `guzzlehttp/guzzle` from 7.8.0 to 7.8.1
- [Release notes](https://github.com/guzzle/guzzle/releases)
- [Changelog](https://github.com/guzzle/guzzle/blob/7.8/CHANGELOG.md)
- [Commits](guzzle/guzzle@7.8.0...7.8.1)

Updates `twig/twig` from 3.7.1 to 3.8.0
- [Changelog](https://github.com/twigphp/Twig/blob/3.x/CHANGELOG)
- [Commits](twigphp/Twig@v3.7.1...v3.8.0)

---
updated-dependencies:
- dependency-name: guzzlehttp/guzzle
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: devcenter-generator-dependencies
- dependency-name: twig/twig
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: devcenter-generator-dependencies
...

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