Update and cleanup macos github runner.

Author: Kasper Peeters

.github/workflows/macos.yml

@@ -8,15 +8,15 @@ jobs:
     runs-on: macos-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: setup python
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
-          python-version: 3.11
+          python-version: 3.12
 
     - name: get dependencies
-      run:  brew install cmake boost pcre gmp python3 pkgconfig gtkmm3 adwaita-icon-theme && /usr/local/bin/python3 -m pip install sympy gmpy2 numpy
+      run:  brew install cmake boost pcre gmp python3 pkgconfig gtkmm3 adwaita-icon-theme && python3 -m pip install sympy gmpy2 numpy
 
     - name: configure
       run:  mkdir build && cd build && cmake -DENABLE_MATHEMATICA=OFF ..