fix: fix slice init length

[cuishuang]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional with a list of types and scopes found here, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• I've signed my commits with DCO
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The intention here should be to initialize a slice with a capacity of 3 rather than initializing the length of this slice.

The only demo: https://go.dev/play/p/q1BcVCmvidW

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

Published E2E Test Results

  4 files    4 suites   3h 15m 42s ⏱️
113 tests 104 ✅  7 💤 2 ❌
454 runs  424 ✅ 28 💤 2 ❌

For more details on these failures, see this check.

Results for commit 06448fb.

[github-actions]

Published Unit Test Results

2 275 tests   2 275 ✅  2m 59s ⏱️
  128 suites      0 💤
    1 files        0 ❌

Results for commit 06448fb.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.84%. Comparing base (6ced7fc) to head (06448fb).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3868      +/-   ##
==========================================
- Coverage   83.87%   83.84%   -0.04%     
==========================================
  Files         163      163              
  Lines       18564    18564              
==========================================
- Hits        15571    15565       -6     
- Misses       2120     2123       +3     
- Partials      873      876       +3     

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