fix pkg_resources api deprecated warning

[zhuwenxing]

/kind improvement

[sre-ci-robot]

@zhuwenxing: The label(s) kind/improvement cannot be applied, because the repository doesn't have them.

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/kind improvement

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[zhuwenxing]

got warnings when using pymilvus

.venv/lib/python3.12/site-packages/pymilvus/client/__init__.py:6
  /Users/zilliz/workspace/milvus_beir/.venv/lib/python3.12/site-packages/pymilvus/client/__init__.py:6: DeprecationWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html
    from pkg_resources import DistributionNotFound, get_distribution

this pr is to fix this warning

[zhuwenxing]

/assign @XuanYang-cn

[XuanYang-cn]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: XuanYang-cn, zhuwenxing

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