build(python): drop support for Python 3.6 and 3.7 (#235)

BREAKING CHANGE: drop support for Python 3.6 and 3.7

Closes reanahub/reana#784

Author: mdonadoni

.github/workflows/ci.yml

@@ -55,7 +55,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.8
+          python-version: "3.8"
 
       - name: Check Python code formatting
         run: |
@@ -72,7 +72,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.8
+          python-version: "3.8"
 
       - name: Check compliance with pep8, pyflakes and circular complexity
         run: |
@@ -89,7 +89,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.8
+          python-version: "3.8"
 
       - name: Check compliance with Python docstring conventions
         run: |
@@ -106,7 +106,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.8
+          python-version: "3.8"
 
       - name: Check Python manifest completeness
         run: |
@@ -123,7 +123,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.8
+          python-version: "3.8"
 
       - name: Install system dependencies
         run: |
@@ -143,7 +143,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - name: Checkout

setup.py

@@ -75,7 +75,7 @@
     },
     zip_safe=False,
     include_package_data=True,
-    python_requires=">=3.6",
+    python_requires=">=3.8",
     install_requires=install_requires,
     extras_require=extras_require,
     setup_requires=setup_requires,
@@ -87,10 +87,11 @@
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python",
         "Topic :: Internet :: WWW/HTTP :: Dynamic Content",