GitHub-CI (macos): Work around conflict between pre-installed and Homebrew Python.

* .github/workflows/make.yaml (macos): GitHub-hosted macOS runners now come
with pre-installed Python 3.12 or 3.13. Force overwriting files from both
pre-installed versions. They conflict with the files from Homebrew's versions
of Python.

Author: mmuetzel

.github/workflows/make-macos.yaml

@@ -73,7 +73,7 @@ jobs:
         # The third block is for additional dependencies needed when building from a repository checkout.
         run: |
           brew update
-          brew install --overwrite python@3.11 python@3.12
+          brew install --overwrite python@3.12 python@3.13
           brew reinstall gcc
           brew install arpack epstool fftw fig2dev fltk fontconfig freetype \
             ghostscript gl2ps glpk gnuplot graphicsmagick hdf5 libsndfile \