Update stacklok/toolhive to v0.23.1

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/upstream-projects.yaml

@@ -35,7 +35,7 @@ projects:
 
   - id: toolhive
     repo: stacklok/toolhive
-    version: v0.22.0
+    version: v0.23.1
     docs_paths:
       - docs/toolhive/guides-cli
       - docs/toolhive/guides-k8s