enhance: Upgrade knowhere to 2.3.1

[liliu-z]

/kind improvement

[mergify[bot]]

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.76%. Comparing base (29d3c57) to head (a2378bb). Report is 8 commits behind head on master.

Additional details and impacted files

[](https://app.codecov.io/gh/milvus-io/milvus/pull/32699?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io) ```diff @@ Coverage Diff @@ ## master #32699 +/- ## ========================================== - Coverage 81.79% 81.76% -0.03% ========================================== Files 998 998 Lines 124188 124209 +21 ========================================== - Hits 101576 101564 -12 - Misses 18762 18781 +19 - Partials 3850 3864 +14 ``` [see 36 files with indirect coverage changes](https://app.codecov.io/gh/milvus-io/milvus/pull/32699/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io)

[yanliang567]

/lgtm /approve

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This pull-request has been approved by: liliu-z, yanliang567

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