Bumping version to 0.4.0

Author: mrmundt

.github/workflows/release_wheel_creation.yml

@@ -77,7 +77,7 @@ jobs:
         python -m pip install --upgrade pip
         pip install twine wheel setuptools
     - name: Build manylinux Python wheels
-      uses: RalfG/python-wheels-manylinux-build@v0.3.3-manylinux2014_aarch64
+      uses: RalfG/python-wheels-manylinux-build@v0.4.0-manylinux2014_aarch64
       with:
         python-versions: 'cp36-cp36m cp37-cp37m cp38-cp38 cp39-cp39'
         build-requirements: 'cython'