build(deps): Bump prio from 0.16.3 to 0.16.4 (#3116)

Bumps [prio](https://github.com/divviup/libprio-rs) from 0.16.3 to 0.16.4.
- [Release notes](https://github.com/divviup/libprio-rs/releases)
- [Changelog](https://github.com/divviup/libprio-rs/blob/main/documentation/releases.md)
- [Commits](divviup/libprio-rs@0.16.3...0.16.4)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -73,7 +73,7 @@ postgres-types = "0.2.6"
 pretty_assertions = "1.4.0"
 # Disable default features so that individual workspace crates can choose to
 # re-enable them
-prio = { version = "0.16.3", default-features = false, features = ["experimental"] }
+prio = { version = "0.16.4", default-features = false, features = ["experimental"] }
 prometheus = "0.13.4"
 querystring = "1.1.0"
 rand = "0.8"