fix twine upload issue

Author: DanielBok

.github/workflows/build.yml

@@ -167,7 +167,9 @@ jobs:
           path: dist
 
       - name: Install twine
-        run: pip install twine
+        run: |
+          pip install twine
+          pip install -U packaging
 
       - name: Move files to top level directory
         run: |

setup.cfg

@@ -34,4 +34,4 @@ classifiers =
     Topic :: Scientific/Engineering
 
 [options]
-python_requires = >= 3.8
+python_requires = >= 3.9