User-agent filtering block valid identifier containing the curl sub-string

### Current Behavior It appears that crates.io blocks all request containing the "curl" substring, even with other identifier correctly set up, preventing reporting the user-agent of the tool used to fetch the data. Example: ``` > curl https://crates.io/api/v1/crates/actix-http/3.11.0/download --user-agent "curl test (marius@mariusdavid.fr)" {"errors":[{"detail":"We are unable to process your request at this time. This usually means that you are in violation of our API data access policy (https://crates.io/data-access). Please email help@crates.io and provide the request id e7b37e83-2065-0ae3-93c3-ae0a6043c4e9"}]} ``` ``` > curl https://crates.io/api/v1/crates/actix-http/3.11.0/download --user-agent "curl/8.20.0 Nixpkgs/26.11" {"errors":[{"detail":"We are unable to process your request at this time. This usually means that you are in violation of our API data access policy (https://crates.io/data-access). Please email help@crates.io and provide the request id def5bc50-f7c6-b8f0-a3a1-8ecc211729c1"}]} ``` Those two request appear to fullfill the requirement for identification as per the Data Access Policy https://crates.io/data-access ### Expected Behavior Fetching success, allowing me to properly compile my application via Nix, and, by extension, update my server. ### Steps To Reproduce _No response_ ### Environment - OS: NixOS ### Anything else? _No response_