remove unused crate

Author: lalitb

opentelemetry-sdk/Cargo.toml

@@ -37,7 +37,6 @@ rustdoc-args = ["--cfg", "docsrs"]
 [dev-dependencies]
 criterion = { workspace = true, features = ["html_reports"] }
 temp-env = { workspace = true }
-num_cpus = "1.15.0"
 
 [target.'cfg(not(target_os = "windows"))'.dev-dependencies]
 pprof = { version = "0.13", features = ["flamegraph", "criterion"] }