👷 Update CI to use python 3.10 as default

Author: pwwang

.github/workflows/build.yml

@@ -10,10 +10,10 @@ on:
 jobs:
 
   build:
-    runs-on: ubuntu-20.04  # lastest doesn't support python3.6
+    runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9, "3.10", 3.11-dev]
+        python-version: [3.8, 3.9, "3.10", "3.11"]
 
     steps:
       - uses: actions/checkout@v3
@@ -46,15 +46,15 @@ jobs:
         run: |
           export CODACY_PROJECT_TOKEN=${{ secrets.CODACY_PROJECT_TOKEN }}
           bash <(curl -Ls https://coverage.codacy.com/get.sh) report -r .coverage.xml
-        if: matrix.python-version == 3.9 && github.event_name != 'pull_request'
+        if: matrix.python-version == "3.10" && github.event_name != 'pull_request'
 
   deploy:
     needs: build
     runs-on: ubuntu-latest
     if: github.event_name == 'release'
     strategy:
       matrix:
-        python-version: [3.9]
+        python-version: ["3.10"]
     steps:
       - uses: actions/checkout@v3
       - name: Setup Python # Set Python version