Update MSRV to 1.71.1 (#949)

Author: bnusunny

README.md

@@ -409,7 +409,7 @@ fn main() -> Result<(), Box<Error>> {
 
 ## Supported Rust Versions (MSRV)
 
-The AWS Lambda Rust Runtime requires a minimum of Rust 1.70, and is not guaranteed to build on compiler versions earlier than that.
+The AWS Lambda Rust Runtime requires a minimum of Rust 1.71.1, and is not guaranteed to build on compiler versions earlier than that.
 
 ## Security