Fix for MacOS 13

When running the CI, we get errors like:

==> Pouring python@3.11--3.11.8.ventura.bottle.tar.gz
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink bin/2to3-3.11
Target /usr/local/bin/2to3-3.11
already exists. You may want to remove it:
  rm '/usr/local/bin/2to3-3.11'

To force the link and overwrite all conflicting files:
  brew link --overwrite python@3.11

To list all files that would be deleted:
  brew link --overwrite python@3.11 --dry-run

Possible conflicting files are:
/usr/local/bin/2to3-3.11 ->
/Library/Frameworks/Python.framework/Versions/3.11/bin/2to3-3.11
/usr/local/bin/idle3.11 ->
/Library/Frameworks/Python.framework/Versions/3.11/bin/idle3.11
/usr/local/bin/pydoc3.11 ->
/Library/Frameworks/Python.framework/Versions/3.11/bin/pydoc3.11
/usr/local/bin/python3.11 ->
/Library/Frameworks/Python.framework/Versions/3.11/bin/python3.11
/usr/local/bin/python3.11-config ->
/Library/Frameworks/Python.framework/Versions/3.11/bin/python3.11-config

Hence, we use a fix described here:
actions/setup-python#577 (comment)

scripts/install_macOS.sh

@@ -1,3 +1,10 @@
+set -eux
+# Temporary fix, see https://github.com/actions/setup-python/issues/577
+rm /usr/local/bin/2to3 || true
+rm /usr/local/bin/idle3 || true
+rm /usr/local/bin/pydoc3 || true
+rm /usr/local/bin/python3 || true
+rm /usr/local/bin/python3-config || true
 brew install bison boost coreutils flex mpich ninja xz wget
 brew unlink mpich
 brew install openmpi