Test: instantiate new clients for every request.

Trying to figure out why I am getting the below error occasionally in gitea:

Delivery: Post "https://webhookbridge.fizz.buzz/hook": context deadline exceeded (Client.Timeout exceeded while awaiting headers)

Cargo.toml

@@ -62,7 +62,7 @@ inherits = "release"
 lto = true
 strip = "symbols"
 
-[profile.dev]
+[target.'cfg(target_os = "linux")'.profile.dev]
 codegen-backend = "cranelift"
 
 [profile.dev.package."*"]