Bump anyhow from 1.0.44 to 1.0.51 in /src/proxy-manager

Bumps [anyhow](https://github.com/dtolnay/anyhow) from 1.0.44 to 1.0.51.
- [Release notes](https://github.com/dtolnay/anyhow/releases)
- [Commits](dtolnay/anyhow@1.0.44...1.0.51)

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

Signed-off-by: dependabot[bot] <support@github.com>