test: Increase PyMilvus version to 2.7.0rc46 for master branch

[XuanYang-cn]

Automated daily bump from pymilvus master branch. Updates tests/python_client/requirements.txt.

[sre-ci-robot]

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[sre-ci-robot]

[ci-v2-notice]
Notice: We are gradually rolling out the new ci-v2 system.

• Legacy CI jobs remain unaffected, you can just ignore ci-v2 if you don't want to run it.
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[mergify]

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