Fix tracing subscriber after introducing Tokio-console (#8907)

We've also upgraded `Axum` in order to avoid having two versions of that
library in Collab (one due to Tokio-console).

Release Notes:

- N/A

---------

Co-authored-by: Conrad <conrad@zed.dev>

crates/collab/k8s/collab.template.yml

@@ -63,6 +63,8 @@ spec:
           ports:
             - containerPort: 8080
               protocol: TCP
+            - containerPort: 6669
+              protocol: TCP
           livenessProbe:
             httpGet:
               path: /healthz