chore(deps): Bump postgres-protocol from 0.6.6 to 0.6.7

Bumps [postgres-protocol](https://github.com/sfackler/rust-postgres) from 0.6.6 to 0.6.7.
- [Release notes](https://github.com/sfackler/rust-postgres/releases)
- [Commits](sfackler/rust-postgres@postgres-protocol-v0.6.6...postgres-protocol-v0.6.7)

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

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