fix(examples): use a defined model label in CVE-2023-2283 taskflow

The second task referenced `gpt_latest`, which is not defined in the taskflow's
model_config (only `gpt_default` is), so it would resolve to a literal, non-
existent provider id and fail at runtime. Point it at `gpt_default`. The offline
linter now reports the whole example corpus clean under --strict.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: anticomputer

examples/taskflows/CVE-2023-2283.yaml

@@ -18,7 +18,7 @@ taskflow:
       toolboxes:
         - seclab_taskflow_agent.toolboxes.memcache
   - task:
-      model: gpt_latest
+      model: gpt_default
       must_complete: false
       agents:
         - seclab_taskflow_agent.personalities.c_auditer