GHSA-2wc2-fm75-p42x: Soup Sieve has Memory Exhaustion via Large Comma-Separated Selector Lists

Soupsieve (the CSS selector engine for Beautiful Soup 4) has a memory exhaustion vulnerability where the CSS parser allocates unbounded memory when compiling large comma-separated selector lists. An attacker can supply a crafted CSS selector string to `soupsieve.compile()` or Beautiful Soup's `.select()` method to cause the application to allocate hundreds of megabytes of memory from a small input, leading to denial of service (making the application unavailable by consuming all available memory).