Bump submodules/vipr from 99fc1a2 to 67801f1

Bumps [submodules/vipr](https://github.com/microsoft/vipr) from `99fc1a2` to `67801f1`.
- [Release notes](https://github.com/microsoft/vipr/releases)
- [Commits](microsoft/Vipr@99fc1a2...67801f1)

---
updated-dependencies:
- dependency-name: submodules/vipr
  dependency-type: direct:production
...

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

Author: dependabot[bot]