elliptic-curve: bump crypto-bigint to v0.7 final release (#2330)

Release PR: RustCrypto/crypto-bigint#1218

Author: tarcieri

Cargo.lock

@@ -16,14 +16,9 @@ and traits for representing various elliptic curve forms, scalars, points,
 and public/secret keys composed thereof.
 """
 
-[dependencies.bigint]
-package = "crypto-bigint"
-version = "0.7.0-rc.27"
-default-features = false
-features = ["hybrid-array", "rand_core", "subtle", "zeroize"]
-
 [dependencies]
 array = { package = "hybrid-array", version = "0.4", default-features = false, features = ["zeroize"] }
+bigint = { package = "crypto-bigint", version = "0.7", default-features = false, features = ["hybrid-array", "rand_core", "subtle", "zeroize"] }
 base16ct = "1"
 common = { package = "crypto-common", version = "0.2", features = ["rand_core"] }
 rand_core = { version = "0.10", default-features = false }