Increment version number to 0.8.40

Author: hsivonen

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "encoding_rs"
 description = "A Gecko-oriented implementation of the Encoding Standard"
-version = "0.8.35"
+version = "0.8.40"
 edition = '2024'
 authors = ["Henri Sivonen <hsivonen@hsivonen.fi>"]
 license = "(Apache-2.0 OR MIT) AND BSD-3-Clause"