fix: 解决 ClamAV 卸载后定时任务无法停止的问题

[ssongliu]

Refs #6100

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[wanghe-fit2cloud]

/lgtm

[wanghe-fit2cloud]

/approve

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