Fix typo in enable_cleanup_closed warning message

[bdraco]

The message had in twice

[codspeed-hq]

CodSpeed Performance Report

Merging #9736 will not alter performance

_{Comparing typo_fix (02d4bbb) with master (c3a9c3e)}

Summary

✅ 14 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.67%. Comparing base (c3a9c3e) to head (02d4bbb).
Report is 2 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9736      +/-   ##
==========================================
+ Coverage   98.60%   98.67%   +0.06%     
==========================================
  Files         117      117              
  Lines       35807    35807              
  Branches     4250     4250              
==========================================
+ Hits        35307    35331      +24     
+ Misses        340      320      -20     
+ Partials      160      156       -4     

Flag	Coverage Δ
CI-GHA	98.55% <ø> (+0.05%)	⬆️
OS-Linux	98.24% <ø> (+0.05%)	⬆️
OS-Windows	95.99% <ø> (ø)
OS-macOS	97.30% <ø> (-0.01%)	⬇️
Py-3.10.11	97.15% <ø> (ø)
Py-3.10.15	97.72% <ø> (ø)
Py-3.11.10	97.77% <ø> (ø)
Py-3.11.9	97.22% <ø> (ø)
Py-3.12.7	98.26% <ø> (ø)
Py-3.13.0	98.24% <ø> (ø)
Py-3.9.13	97.07% <ø> (ø)
Py-3.9.20	97.63% <ø> (ø)
Py-pypy7.3.16	97.25% <ø> (?)
VM-macos	97.30% <ø> (-0.01%)	⬇️
VM-ubuntu	98.24% <ø> (+0.05%)	⬆️
VM-windows	95.99% <ø> (ø)

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[patchback]

Backport to 3.10: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.10/5ddeb06f98b135c5c7169e605d09574ebab4a8e7/pr-9736

Backported as #9739

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[patchback]

Backport to 3.11: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.11/5ddeb06f98b135c5c7169e605d09574ebab4a8e7/pr-9736

Backported as #9740

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.