ci: Use the final Python 3.11 version (#39)

- ci: Add an env variable with the default Python version
- ci: Test with the final Python 3.11 version
- ci: Update the default Python version to 3.11

Fixes #36.

Author: llucax

.github/workflows/ci.yaml

@@ -2,6 +2,9 @@ name: frequenz-channels-python
 
 on: [pull_request, push, workflow_dispatch]
 
+env:
+  DEFAULT_PYTHON_VERSION: "3.11"
+
 jobs:
   test:
     strategy:
@@ -12,7 +15,7 @@ jobs:
           - "3.8"
           - "3.9"
           - "3.10"
-          - "3.11-dev"
+          - "3.11"
     runs-on: ${{ matrix.os }}
 
     steps:
@@ -49,7 +52,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: "3.10"
+          python-version: ${{ env.DEFAULT_PYTHON_VERSION }}
 
       - name: Install build dependencies
         run: |
@@ -79,7 +82,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: "3.10"
+          python-version: ${{ env.DEFAULT_PYTHON_VERSION }}
 
       - name: Install build dependencies
         run: |
@@ -156,7 +159,7 @@ jobs:
         if: steps.mike-metadata.outputs.version
         uses: actions/setup-python@v4
         with:
-          python-version: "3.10"
+          python-version: ${{ env.DEFAULT_PYTHON_VERSION }}
 
       - name: Install build dependencies
         if: steps.mike-metadata.outputs.version