fix(ethers): useEthersSigner hook issue when chain not contain

[jeasonstudio]

修复 ethers 包内部的一个问题，当钱包连接了一个未被当前项目定义的 chain 时，client.chain 为 null

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Name	Status	Preview	Comments	Updated (UTC)
ant-design-web3	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 4, 2024 8:38am

[changeset-bot]

🦋 Changeset detected

Latest commit: f7277e8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
@ant-design/web3-ethers	Patch
@ant-design/web3-ethers-v5	Patch
@example/ethers	Patch
@example/ethers-v5	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (fb35753) to head (f7277e8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #932   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          712       712           
  Lines        21610     21610           
  Branches      1225      1225           
=========================================
  Hits         21610     21610           

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