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)

src/webhook.rs

@@ -42,7 +42,7 @@ pub(crate) async fn hook(
     debug!("REQ: {:?}", payload);
     match payload {
         HookRequest::Push(webhook_payload) => {
-            let kubernetes_client: Client = Client::try_default()
+            let kubernetes_client: kube::Client = kube::Client::try_default()
                 .await
                 .expect("Set KUBECONFIG to a valid kubernetes config.");