Standardize network tools

When performing network operations in build scripts or containers, prefer curl over wget for HTTP requests to standardize dependencies and improve portability. Use the specific flags -fsSL for silent operation with proper error handling, and explicitly specify output destinations.

Additionally, ensure network services support both IPv4 and IPv6 addressing by using dual-stack binding configurations rather than binding only to 0.0.0.0 (IPv4).

Example replacing wget with curl:

# Instead of:
wget -q -O- https://example.com/file.tar.gz | tar xz

# Use:
curl -fsSL https://example.com/file.tar.gz | tar xz

Example of dual-stack binding in gunicorn:

# Instead of:
gunicorn -w 3 --bind 0.0.0.0:5000 app:app

# Use:
gunicorn -w 3 --bind 0.0.0.0:5000 --bind [::]:5000 app:app