Avoid installing gmp when executing install-macos.sh (#2063)

* avoid installing gmp if it is already installed

* fix

* fix if

* force gmp installation

---------

Co-authored-by: Gabriel Bosio <38794644+gabrielbosio@users.noreply.github.com>

Author: FrancoGiachetta

install-scripts/install-macos.sh

@@ -8,6 +8,11 @@ source "$HOME/.cargo/env"
 # Make sure Rust has been installed correctly
 rustc --version
 
+# Install pyenv
+brew install pyenv
+
+# install gmp
+brew install --force gmp
 # Install uv
 curl -LsSf https://astral.sh/uv/install.sh | sh