Remove scons from Homebrew dependencies

Since we now install scons via pip in the venv (to run with the correct
Python environment), we don't need it as a Homebrew dependency.

Removed scons from:
- Formula depends_on list
- CI workflow dependency installation

Author: sbryngelson

.github/workflows/homebrew.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Install formula dependencies
         run: |
           echo "Installing MFC dependencies..."
-          brew install cmake gcc scons [email protected] boost fftw hdf5 open-mpi openblas sundials yaml-cpp
+          brew install cmake gcc [email protected] boost fftw hdf5 open-mpi openblas sundials yaml-cpp
       
       - name: Validate formula syntax
         run: |

packaging/homebrew/mfc.rb

@@ -12,7 +12,6 @@ class Mfc < Formula
 
   depends_on "cmake" => :build
   depends_on "gcc" => :build
-  depends_on "scons" => :build
 
   depends_on "boost"
   depends_on "fftw"