update python versions in GH workflows

Author: phobson

.github/workflows/check-test-coverage.yml

@@ -13,7 +13,7 @@ jobs:
     - name: Setup Python
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8
+        python-version: 3.10
     - name: Generate coverage report
       run: |
         python -m pip install --upgrade pip

.github/workflows/python-runlinter.yml

@@ -15,10 +15,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.8
+    - name: Set up Python
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8
+        python-version: 3.10
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip

.github/workflows/python-runtests-basic.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8, 3.9]
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
 
     steps:
     - uses: actions/checkout@v2

.github/workflows/python-runtests-img-comp.yml

@@ -15,10 +15,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.8
+    - name: Set up Python
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8
+        python-version: 3.10
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip