`SkinnedMeshBatchRenderer.prototype.cook` calls `set skeleton` recursively

[jcyuan]

Cocos Creator version

3.8.8

System information

windows 10

Issue description

wrong logic on set skeleton in SkinnedMeshBatchRenderer class

Relevant error log output

No response

Steps to reproduce

const smbr = new SkinnedMeshBatchRenderer();
smbr.skinningRoot = theRoot;
smbr.units.push(u1);
smbr.units.push(u2);
smbr.cook();    <------------ ERROR

Minimal reproduction project

No response