Update Rust crate bigdecimal to v0.4.8

Author: renovate[bot]

Cargo.lock

@@ -58,7 +58,7 @@ aws-sdk-sqs = "=1.64.0"
 axum = { version = "=0.8.3", features = ["macros", "matched-path"] }
 axum-extra = { version = "=0.11.0", features = ["erased-json", "query", "typed-header"] }
 base64 = "=0.22.1"
-bigdecimal = { version = "=0.4.7", features = ["serde"] }
+bigdecimal = { version = "=0.4.8", features = ["serde"] }
 bon = "=3.5.1"
 cargo-manifest = "=0.19.1"
 colored = "=3.0.0"