Bump crypto-bigint to v0.7 final release (#672)

Release PR: RustCrypto/crypto-bigint#1218

Author: tarcieri

Cargo.lock

@@ -15,7 +15,7 @@ exclude = ["marvin_toolkit/", "thirdparty/"]
 
 [dependencies]
 const-oid = { version = "0.10", default-features = false }
-crypto-bigint = { version = "0.7.0-rc.28", default-features = false, features = ["zeroize", "alloc"] }
+crypto-bigint = { version = "0.7", default-features = false, features = ["zeroize", "alloc"] }
 crypto-primes = { version = "0.7.0-pre.9", default-features = false }
 digest = { version = "0.11", default-features = false, features = ["alloc", "oid"] }
 rand_core = { version = "0.10", default-features = false }