Bump pprof version

Dependabot warns about unsound usage in older versions, so bump the
version:

https://github.com/tursodatabase/libsql/security/dependabot/68

Author: penberg

Cargo.lock

@@ -48,7 +48,7 @@ chrono = { version = "0.4", optional = true }
 
 [dev-dependencies]
 criterion = { version = "0.5", features = ["html_reports", "async", "async_futures", "async_tokio"] }
-pprof = { version = "0.12.1", features = ["criterion", "flamegraph"] }
+pprof = { version = "0.14.0", features = ["criterion", "flamegraph"] }
 tokio = { version = "1.29.1", features = ["full"] }
 tokio-test = "0.4"
 tracing-subscriber = "0.3"