chore(release): bump version to 0.1.0-alpha.13

Author: pranamphd

rust/digipin/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "digipin-rs"
-version = "0.1.0-alpha.12"
+version = "0.1.0-alpha.13"
 edition = "2024"
 license = "Apache-2.0"
 description = "Rust library for encoding and decoding DIGIPIN (Digital Postal Index Number)"