Bump prometheus from 0.12.0 to 0.13.0 (#1079)

Bumps [prometheus](https://github.com/tikv/rust-prometheus) from 0.12.0 to 0.13.0.
- [Release notes](https://github.com/tikv/rust-prometheus/releases)
- [Changelog](https://github.com/tikv/rust-prometheus/blob/master/CHANGELOG.md)
- [Commits](tikv/rust-prometheus@v0.12.0...v0.13.0)

---
updated-dependencies:
- dependency-name: prometheus
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

util/grpc/Cargo.toml

@@ -24,7 +24,7 @@ hex = "0.4"
 hex_fmt = "0.3"
 hmac = "0.10"
 lazy_static = "1.4"
-prometheus = "0.12"
+prometheus = "0.13"
 protobuf = "2.22.1"
 rand = "0.8"
 sha2 = "0.9.5"

util/metrics/Cargo.toml

@@ -9,6 +9,6 @@ chrono = "0.4"
 mc-common = { path = "../../common", features = ["log"] }
 grpcio = "0.9.0"
 lazy_static = "1.4"
-prometheus = "0.12"
+prometheus = "0.13"
 protobuf = "2.22.1"
 serde_json = "1.0"