fix: Update generic_client.go, resolve the issue where the kitexcall -f /path/to/file.json command is not working.

[xuanskyer]

Resolve the issue where the kitexcall -f /path/to/file.json command is not working.

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fix: A bug fix

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[xuanskyer]

@Zzhiter @HeyJavaBean pls help review this PR, tks!

[Zzhiter]

@xuanskyer Could you please rebase mater? CI fails to run now and needs to be updated.

[GuangmingLuo]

Please rebase main

[xuanskyer]

Please rebase main

done

[xuanskyer]

@xuanskyer Could you please rebase mater? CI fails to run now and needs to be updated.

done