Update workflows and pyproject toml to install scs

.github/workflows/linux_build.yml

@@ -32,6 +32,7 @@ jobs:
           python -m pip install "numpy<=1.96.0"
           python -m pip install scipy
           python -m pip install scikit-image
+          python -m pip install scs
           sudo apt-get install \
               libmpfr-dev \
               libgmp-dev \

.github/workflows/macos_build.yml

@@ -28,6 +28,7 @@ jobs:
           ${{ steps.installpython.outputs.python-path }} -m pip install "numpy<=1.96.0"
           ${{ steps.installpython.outputs.python-path }} -m pip install scipy
           ${{ steps.installpython.outputs.python-path }} -m pip install scikit-image
+          ${{ steps.installpython.outputs.python-path }} -m pip install scs
 
       - name: Install c++ bindings
         shell: bash -l {0}

.github/workflows/windows_build.yml

@@ -32,6 +32,7 @@ jobs:
           python -m pip install "numpy<=1.96.0"
           python -m pip install scipy
           python -m pip install scikit-image
+          python -m pip install scs
 
       # - name: Install dependencies (Windows)
       #   shell: bash -l {0}

pyproject.toml

@@ -7,8 +7,7 @@ requires = [
     "setuptools>=42",
     "wheel",
     "cmake>=3.16",
-    "packaging",
-    "scs"
+    "packaging"
 ]
 
 build-backend = "setuptools.build_meta"