apis: fix type of MinResources in podgroup

[zwzhang0107]

Ⅰ. Describe what this PR does

the type of MinResources is v1.ResourceList in upstream
https://github.com/kubernetes-sigs/scheduler-plugins/blob/release-1.28/apis/scheduling/v1alpha1/types.go#L145

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.68%. Comparing base (749b14d) to head (ccef094).
Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2212      +/-   ##
==========================================
- Coverage   67.72%   67.68%   -0.05%     
==========================================
  Files         446      446              
  Lines       42686    42719      +33     
==========================================
+ Hits        28908    28913       +5     
- Misses      11259    11280      +21     
- Partials     2519     2526       +7     

Flag	Coverage Δ
unittests	67.68% <ø> (-0.05%)	⬇️

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[ZiMengSheng]

/lgtm