fix(components): [select] correct update selectSize

[acyza]

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fix #11962

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🧪 Playground Preview: https://element-plus.run/?pr=11973
Please comment the example via this playground if needed.

[chenxch]

@acyza Thanks for your contribution, would you mind adding a test case for this?

[acyza]

@acyza Thanks for your contribution, would you mind adding a test case for this?

https://github.com/element-plus/element-plus/blob/dev/packages/components/select/__tests__/select.test.ts#L2030
这条测试能过是因为它测试环境拿到的input的clientHeight始终为0，给它模拟一个clientHeight的值问题就显现出来了。

相关代码：https://github.com/element-plus/element-plus/blob/dev/packages/components/select/src/useSelect.ts#L377-L386

[chenxch]

Good job.

[chenxch]

/cc @element-plus/backers