enhance: Upgrade knowhere to 2.3.1

[liliu-z]

/kind improvement

[mergify]

@liliu-z

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[mergify]

@liliu-z E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

@@            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

[yanliang567]

/lgtm
/approve

[sre-ci-robot]

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

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