Updates build.yml to run on Python 3.10

PiperOrigin-RevId: 555422412

Author: andsteing

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8]
+        python-version: ['3.10']
     steps:
     - name: Cancel previous
       uses: styfle/cancel-workflow-action@0.8.0