build(deps): bump slang from cbe87d2 to 47a4dc9

Bumps [slang](https://github.com/MikePopoloski/slang) from `cbe87d2` to `47a4dc9`.
- [Release notes](https://github.com/MikePopoloski/slang/releases)
- [Commits](MikePopoloski/slang@cbe87d2...47a4dc9)

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

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