bump rust version

Author: adriangb

Cargo.toml

@@ -8,7 +8,7 @@ license = "Apache-2.0"
 keywords = ["datafusion", "JSON", "SQL"]
 categories = ["database-implementations", "parsing"]
 repository = "https://github.com/datafusion-contrib/datafusion-functions-json/"
-rust-version = "1.80.1"
+rust-version = "1.81.0"
 
 [dependencies]
 datafusion = { version = "45", default-features = false }