Bump cppfront from 2ea1950 to 71b9cb0

Bumps [cppfront](https://github.com/hsutter/cppfront) from `2ea1950` to `71b9cb0`.
- [Release notes](https://github.com/hsutter/cppfront/releases)
- [Commits](hsutter/cppfront@2ea1950...71b9cb0)

---
updated-dependencies:
- dependency-name: cppfront
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>