update python versions in workflow

Author: d-biehl

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         os: [macos-latest, ubuntu-latest, windows-latest]
-        python-version: ["3.8", "3.9"]
+        python-version: ["3.8", "3.9", "3.10"]
 
     steps:
       - uses: actions/checkout@v2
@@ -72,7 +72,7 @@ jobs:
       - name: setup python environment
         uses: actions/setup-python@v2
         with:
-          python-version: "3.9"
+          python-version: "3.8"
 
       - uses: Gr1N/setup-poetry@v7
 
@@ -111,7 +111,7 @@ jobs:
           node-version: "14"
       - uses: actions/setup-python@v2
         with:
-          python-version: "3.9"
+          python-version: "3.8"
 
       - uses: Gr1N/setup-poetry@v7