zephyr-bindgen: update to latest bindgen compatible with Rust 1.70

0.70 requires a feature from Rust 1.77.

error[E0433]: failed to resolve: could not find `offset_of` in `mem`

Author: tylerwhall

zephyr-bindgen/Cargo.lock

@@ -11,4 +11,4 @@ homepage = "https://github.com/tylerwhall/zephyr-rust"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-bindgen = "0.61.0"
+bindgen = "0.69"