enhance: Bump milvus & proto version to v2.4.21

[congqixia]

No description provided.

[congqixia]

/kind branch-feature

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.55%. Comparing base (ca7ecdb) to head (0f04eb9).
Report is 5 commits behind head on 2.4.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #39328      +/-   ##
==========================================
- Coverage   80.46%   79.55%   -0.92%     
==========================================
  Files        1079     1079              
  Lines      169889   169917      +28     
==========================================
- Hits       136703   135177    -1526     
- Misses      28696    30249    +1553     
- Partials     4490     4491       +1     

Files with missing lines	Coverage Δ
pkg/common/version.go	100.00% <100.00%> (ø)

... and 106 files with indirect coverage changes

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: congqixia, czs007

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