Fix typo in Milvus environment variable name

[liubiqu]

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[mergify]

@liubiqu Thanks for your contribution. Please submit with DCO, see the contributing guide https://github.com/zilliztech/milvus-backup/blob/main/CONTRIBUTING.md#developer-certificate-of-origin-dco.

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@liubiqu Please associate the related issue to the body of your Pull Request. (eg. “issue: #”)