Bump submodules/vipr from dea05c6 to 99fc1a2

Bumps [submodules/vipr](https://github.com/microsoft/vipr) from `dea05c6` to `99fc1a2`.
- [Release notes](https://github.com/microsoft/vipr/releases)
- [Commits](microsoft/Vipr@dea05c6...99fc1a2)

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

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

Author: dependabot[bot]