[pre-commit.ci] pre-commit autoupdate (#2906)

* [pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/psf/black-pre-commit-mirror: 23.11.0 → 23.12.0](psf/black-pre-commit-mirror@23.11.0...23.12.0)
- [github.com/astral-sh/ruff-pre-commit: v0.1.7 → v0.1.8](astral-sh/ruff-pre-commit@v0.1.7...v0.1.8)

* Fix unused variable

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: CoolCat467 <52022020+CoolCat467@users.noreply.github.com>

.pre-commit-config.yaml

@@ -19,11 +19,11 @@ repos:
       - id: sort-simple-yaml
         files: .pre-commit-config.yaml
   - repo: https://github.com/psf/black-pre-commit-mirror
-    rev: 23.11.0
+    rev: 23.12.0
     hooks:
       - id: black
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.1.7
+    rev: v0.1.8
     hooks:
       - id: ruff
         types: [file]

notes-to-self/aio-guest-test.py

@@ -37,6 +37,7 @@ async def trio_main():
         from_trio.put_nowait(n + 1)
         if n >= 10:
             return
+    del _task_ref
 
 
 async def aio_pingpong(from_trio, to_trio):