build(python): drop support for Python 3.6 and 3.7 (reanahub#683)

BREAKING CHANGE: drop support for Python 3.6 and 3.7

Closes reanahub/reana#784

.github/workflows/ci.yml

@@ -136,14 +136,28 @@ jobs:
 
   python-tests:
     runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        include:
+          - python-version: "3.8"
+            continue-on-error: false
+          - python-version: "3.9"
+            continue-on-error: true
+          - python-version: "3.10"
+            continue-on-error: true
+          - python-version: "3.11"
+            continue-on-error: true
+          - python-version: "3.12"
+            continue-on-error: true
+    continue-on-error: ${{ matrix.continue-on-error }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.8
+          python-version: ${{ matrix.python-version }}
 
       - name: Install Python dependencies
         run: |

setup.py

@@ -139,6 +139,7 @@
         ],
     },
     include_package_data=True,
+    python_requires=">=3.8",
     extras_require=extras_require,
     install_requires=install_requires,
     setup_requires=setup_requires,