Download CMake on homebrew because PETSc release does not support version 4.0 yet (#4182)

Author: connorjward

scripts/firedrake-configure

@@ -385,6 +385,8 @@ def prepare_configure_options(
         # Avoid macos + openmpi + mumps segmentation violation issue;
         # see https://github.com/firedrakeproject/firedrake/issues/4102 and https://github.com/firedrakeproject/firedrake/issues/4113.
         configure_options.append("-download-mumps-avoid-mpi-in-place")
+        # PETSc does not support CMake 4.0 (hopefully fixed in v3.23.1)
+        configure_options.append("--download-cmake")
     else:
         configure_options.append("--FOPTFLAGS='-O3 -march=native -mtune=native'")