doc: [skip e2e] change milvus version to 2.4.12

[pingliu]

No description provided.

[LoveEachDay]

/lgtm

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.44%. Comparing base (d1060c0) to head (ae429bb).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #36769      +/-   ##
==========================================
- Coverage   82.47%   82.44%   -0.03%     
==========================================
  Files        1305     1305              
  Lines      153715   153724       +9     
==========================================
- Hits       126769   126735      -34     
- Misses      21866    21902      +36     
- Partials     5080     5087       +7     

see 41 files with indirect coverage changes