build(deps): update pprof requirement from 0.11.1 to 0.12.1

Updates the requirements on [pprof](https://github.com/tikv/pprof-rs) to permit the latest version.
- [Changelog](https://github.com/tikv/pprof-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tikv/pprof-rs/commits)

---
updated-dependencies:
- dependency-name: pprof
  dependency-type: direct:production
...

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

Cargo.toml

@@ -41,7 +41,7 @@ async-trait = "0.1.56"
 criterion = { version = "0.4.0", default-features = false, features = ["html_reports"] }
 opentelemetry-jaeger = "0.19.0"
 opentelemetry-stdout = { version = "0.1.0", features = ["trace"] }
-pprof = { version = "0.11.1", features = ["flamegraph", "criterion"] }
+pprof = { version = "0.12.1", features = ["flamegraph", "criterion"] }
 futures-util = { version = "0.3", default-features = false }
 tokio = { version = "1", features = ["full"] }
 tokio-stream = "0.1"