Update prometheus requirement in the rust-dependencies group

Updates the requirements on [prometheus](https://github.com/tikv/rust-prometheus) to permit the latest version.

Updates `prometheus` to 0.14.0
- [Changelog](https://github.com/tikv/rust-prometheus/blob/master/CHANGELOG.md)
- [Commits](tikv/rust-prometheus@v0.13.3...v0.14.0)

---
updated-dependencies:
- dependency-name: prometheus
  dependency-type: direct:production
  dependency-group: rust-dependencies
...

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

Author: dependabot[bot]

crates/grafana-plugin-sdk/Cargo.toml

@@ -45,7 +45,7 @@ bytes = "1.4.0"
 futures = "0.3.28"
 paste = "1.0.12"
 pretty_assertions = "1.3.0"
-prometheus = { version = "0.13.3", default-features = false }
+prometheus = { version = "0.14.0", default-features = false }
 tokio = { version = "1.28.2", features = ["rt-multi-thread"] }
 tokio-stream = "0.1.14"