test: add a case for bad package URLs starting with numbers

Signed-off-by: hi-rustin <rustin.liu@gmail.com>

Author: 0xPoe

src/cargo/util_schemas/core/package_id_spec.rs

@@ -602,5 +602,6 @@ mod tests {
         .is_err());
         assert!(PackageIdSpec::parse("@1.2.3").is_err());
         assert!(PackageIdSpec::parse("registry+https://github.com").is_ok());
+        assert!(PackageIdSpec::parse("https://crates.io/1foo#1.2.3").is_ok())
     }
 }