Updated secp256k1 version to 0.28

Author: bcsongor

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "tinyvanityeth"
-version = "1.1.1"
+version = "1.1.2"
 description = "Tiny and fast command line tool to find vanity Ethereum addresses."
 authors = ["Csongor Bokay <[email protected]>"]
 license = "GPL-3.0-or-later"
@@ -14,7 +14,7 @@ edition = "2021"
 getopts = "0.2"
 num_cpus = "1"
 regex = "1"
-secp256k1 = { version = "0.27", features = ["std", "rand-std", "global-context"] }
+secp256k1 = { version = "0.28", features = ["std", "rand-std", "global-context"] }
 tiny-keccak = { version = "2", features = ["keccak"] }
 rust_decimal = { version = "1", features = ["maths"] }