Update Rust crate tempfile to 3.8

Author: renovate[bot]

Cargo.lock

@@ -182,7 +182,7 @@ opentelemetry = { version = "0.20.0", features = ["rt-tokio"] }
 opentelemetry-otlp = { version = "0.13.0" }
 proptest = "1.1.0"
 rustup-macros = { path = "rustup-macros" }
-tempfile = "3.7"
+tempfile = "3.8"
 termcolor = "1.2"
 thiserror = "1.0"
 tokio = { version = "1.26.0", default-features = false, features = [