fix(components): [cascader] The height changes as you multiple select

[GuoJikun]

When a component has multiple selection enabled, the height changes when one of the items is selected

closed #13017

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Description

🤖 Generated by Copilot at 1bc0d2a

Reduced the height of the input element in cascader.vue to prevent scrolling issues with tags. This fixed issue #13107.

Related Issue

Fixes #13107.

Explanation of Changes

🤖 Generated by Copilot at 1bc0d2a

• Reduce the offsetHeight of the inputInner element to prevent vertical scrolling with multiple tags (#13107) (link)

[pull-request-triage[bot]]

👋 @GuoJikun, seems like this is your first time contribution to element-plus.

• Please make sure that you have read our guidelines and code of conduct before making a contribution.
• You can comment with /label Components:[component_name] to add a label for which component you are working on.
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[github-actions[bot]]

[github-actions[bot]]

Hello @GuoJikun, thank you for contributing to element-plus, please see our guideline to see how to make contribution

[GuoJikun]

/label Components:[cascader]

[GuoJikun]

/label Components:cascader

[GuoJikun]

Can someone handle this?