pushed minimum Python version and fixed GihubActions

Signed-off-by: Ilias Karimalis <iliaskarimalis@outlook.com>

.github/workflows/main.yml

@@ -227,7 +227,7 @@ jobs:
               if: ${{ !startsWith(matrix.config.name, 'Windows') || (startsWith(matrix.config.name, 'Windows') && matrix.config.python-minor-version == 12) }}
               run: |
                   python3 -c "import sys; exit(not (sys.version_info.major == 3 and sys.version_info.minor == 12))"
-                  pip3 install attrs packaging editables pandas scikit-learn sortedcontainers gmpy2 matplotlib
+                  pip3 install attrs packaging editables pandas scikit-learn sortedcontainers gmpy2==2.2.0a1 matplotlib
                   python3 -c "import os; import subprocess; exit(subprocess.run(['pip3', 'install', 'dist/{}'.format(os.listdir('dist')[0])]).returncode)"
                   python3 gosdt/example.py
             # Upload the wheel file

setup.py

@@ -26,7 +26,7 @@
     packages=find_packages(where='.'),
     cmake_install_dir="gosdt",
     cmake_args=cmake_args,
-    python_requires=">=3.7",
+    python_requires=">=3.8",
     long_description=pathlib.Path("README_PyPI.md").read_text(encoding="utf-8"),
     long_description_content_type="text/markdown",
     install_requires=["setuptools",