Bump submodules/vipr from 6d85135 to a074ff0

Bumps [submodules/vipr](https://github.com/microsoft/vipr) from `6d85135` to `a074ff0`.
- [Release notes](https://github.com/microsoft/vipr/releases)
- [Commits](microsoft/Vipr@6d85135...a074ff0)

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

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

Author: dependabot[bot]