Update Python versions in CI workflow

Author: arjunsuresh

.github/workflows/mlperf-inference-resnet50.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.14", "3.11", "3.8"]
+        python-version: ["3.13", "3.11", "3.9"]
         on: [ubuntu-latest, macos-latest, windows-latest]
         backend: [ "onnxruntime", "tf" ]
         implementation: [ "python", "cpp" ]