ci(.github/workflows): drop Python 3.6 from CI/CD

Python 3.6 is EOL, ubuntu-latest runner no longer support it

Author: shc261392

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python-version: ['3.6', '3.7', '3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
 
     steps:
     - uses: actions/checkout@v3

.github/workflows/python-publish.yml

@@ -18,7 +18,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v3
       with:
-        python-version: '3.6'
+        python-version: '3.7'
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip