Fix macOS dependency installation in GitHub Actions

- Make brew update non-fatal
- Add fallback logic for pip installation (try pip3, python3 -m pip, or ensurepip first)
- This fixes the 'Install Dependencies' step failure on macOS runners

Author: ahmed-irfan

.github/actions/install-dependencies/action.yml

@@ -20,9 +20,16 @@ runs:
       shell: bash
       run: |
         echo "Install Mac dependencies"
-        brew update
+        brew update || true
         ## gmp and python are already installed in the latest macOS
         # brew install gmp
         # brew install python
-        python3 -m pip install sympy
+        if command -v pip3 &> /dev/null; then
+          pip3 install sympy
+        elif python3 -m pip --version &> /dev/null; then
+          python3 -m pip install sympy
+        else
+          python3 -m ensurepip --upgrade || python3 -m ensurepip
+          python3 -m pip install sympy
+        fi
         echo "Install Mac dependencies [DONE]"