upgrade Windows test matrix to 3.10

who knows, might fix weird venv bug

Author: minrk

.github/workflows/test.yml

@@ -42,7 +42,7 @@ jobs:
           - python: "3.9"
             env:
               IPP_ENABLE_CURVE: "1"
-          - python: "3.8"
+          - python: "3.10"
             runs_on: windows-2019
           - python: "3.9"
             runs_on: macos-10.15