fix typo in pkg/koordlet/metriccache/api.go

[jasonliu747]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[koordinator-bot]

New changes are detected. LGTM label has been removed.

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[codecov]

Codecov Report

Base: 68.92% // Head: 68.89% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (767aa77) compared to base (22e9d78).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #725      +/-   ##
==========================================
- Coverage   68.92%   68.89%   -0.03%     
==========================================
  Files         205      205              
  Lines       23329    23329              
==========================================
- Hits        16079    16073       -6     
- Misses       6141     6149       +8     
+ Partials     1109     1107       -2     

Flag	Coverage Δ
unittests	68.89% <ø> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/koordlet/statesinformer/states_pods.go	54.60% <0.00%> (-2.13%)	⬇️
...eduler/plugins/coscheduling/controller/podgroup.go	70.29% <0.00%> (-1.99%)	⬇️
pkg/util/httputil/reverseproxy.go	84.84% <0.00%> (-0.27%)	⬇️
pkg/koordlet/runtimehooks/reconciler/reconciler.go	81.05% <0.00%> (+2.10%)	⬆️

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