CI faulure: BROKEN plugin-spenderp

Unrelated faulure inside the CI

```
lightningd-1 2024-11-13T07:15:15.499Z DEBUG gossipd: Shutting down
lightningd-1 2024-11-13T07:15:15.532Z DEBUG hsmd: Shutting down
{'github_repository': 'ElementsProject/lightning', 'github_sha': '254d079e69501119aae75f7ea200d5bc43c7c6da', 'github_ref': 'refs/pull/7803/merge', 'github_ref_name': 'HEAD', 'github_run_id': 11811119714, 'github_head_ref': 'guilt/pr-7556', 'github_run_number': 11470, 'github_base_ref': 'master', 'github_run_attempt': '2', 'testname': 'test_important_plugin', 'start_time': 1731482015, 'end_time': 1731482115, 'outcome': 'success'}
----------------------------- Captured stderr call -----------------------------
Lost connection to the RPC socket.Reading JSON input: Connection reset by peerReading JSON input: Connection reset by peerReading JSON input: Connection reset by peer
--------------------------- Captured stdout teardown ---------------------------
['lightningd-1 2024-11-13T07:14:12.293Z **BROKEN** plugin-spenderp: Lost connection to the RPC socket.']
===Flaky Test Report===

```

merging this, and opening an issue for the CI faulure

_Originally posted by @vincenzopalazzo in https://github.com/ElementsProject/lightning/issues/7803#issuecomment-2473445582_