Bump granian from 1.6.1 to 1.6.3

Bumps [granian](https://github.com/emmett-framework/granian) from 1.6.1 to 1.6.3.
- [Release notes](https://github.com/emmett-framework/granian/releases)
- [Commits](emmett-framework/granian@v1.6.1...v1.6.3)

---
updated-dependencies:
- dependency-name: granian
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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