Fixed tests regarding issue #143

Removed pip from build-system, shouldn't work either way

Trying forcing pip version

Trying forcing pip version

Removing install_requires

Problem seems to originate from pip version

Trying setuptools in install_requires again

Testing installing setuptools before requirements

Removed setuptools from setup.py, doesn't seem to make much sense

Testing forcing setuptools version in pyproject.toml

Testing setuptools in install_requires

Testing setup_requires in setup.py

Run tests

.github/workflows/python_build.yml

@@ -17,7 +17,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip
+          python -m pip install pip==21
           pip install -r requirements.txt
       - name: Lint with flake8
         run: |

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=40.6.0", "wheel"]
+requires = ["setuptools==65.5.0", "wheel"]
 build-backend = "setuptools.build_meta"