Bump blitz from 2.0.0-beta.16 to 2.0.0-beta.19

Bumps [blitz](https://github.com/blitz-js/blitz) from 2.0.0-beta.16 to 2.0.0-beta.19.
- [Release notes](https://github.com/blitz-js/blitz/releases)
- [Commits](https://github.com/blitz-js/blitz/compare/[email protected]@2.0.0-beta.19)

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

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