srp: bump crypto-bigint to v0.7 (#279)

Release PR: RustCrypto/crypto-bigint#1218

Author: tarcieri

Cargo.lock

@@ -17,7 +17,7 @@ edition = "2024"
 rust-version = "1.85"
 
 [dependencies]
-bigint = { package = "crypto-bigint", version = "0.7.0-rc.26", features = ["alloc"] }
+bigint = { package = "crypto-bigint", version = "0.7", features = ["alloc"] }
 common = { package = "crypto-common", version = "0.2" }
 digest = "0.11.0-rc.11"
 subtle = { version = "2.4", default-features = false }