Bump prometheus from 0.11.0 to 0.12.0 (#9454)

Bumps [prometheus](https://github.com/tikv/rust-prometheus) from 0.11.0 to 0.12.0.
- [Release notes](https://github.com/tikv/rust-prometheus/releases)
- [Changelog](https://github.com/tikv/rust-prometheus/blob/master/CHANGELOG.md)
- [Commits](tikv/rust-prometheus@v0.11.0...v0.12.0)

---
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>

client/utils/Cargo.toml

@@ -12,7 +12,7 @@ readme = "README.md"
 [dependencies]
 futures = "0.3.9"
 lazy_static = "1.4.0"
-prometheus = { version = "0.11.0", default-features = false }
+prometheus = { version = "0.12.0", default-features = false }
 futures-timer = "3.0.2"
 
 [features]

utils/prometheus/Cargo.toml

@@ -14,7 +14,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 
 [dependencies]
 log = "0.4.8"
-prometheus = { version = "0.11.0", default-features = false }
+prometheus = { version = "0.12.0", default-features = false }
 futures-util = { version = "0.3.17", default-features = false, features = ["io"] }
 derive_more = "0.99"
 async-std = { version = "1.10.0", features = ["unstable"] }