fix(example): slice init length for prompt

[cuishuang]

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The intention here should be to initialize a slice with a capacity of len(oidcPrompt rather than initializing the length of this slice.

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.09%. Comparing base (0992c5f) to head (c7d24a5).
Report is 95 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #658      +/-   ##
==========================================
+ Coverage   60.06%   62.09%   +2.03%     
==========================================
  Files          80       81       +1     
  Lines        6998     6218     -780     
==========================================
- Hits         4203     3861     -342     
+ Misses       2498     2047     -451     
- Partials      297      310      +13     

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[github-actions]

🎉 This PR is included in version 3.30.1 🎉

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