zephyr-sys: Bump to newer bindgen

This fixes a weird issue with bindgen missing the `__device_dts_ord_nn`
declarations in some circumstances.  It is unclear when this was
occuring, and hopefully it doesn't return at some point.

Signed-off-by: David Brown <[email protected]>

Author: d3zd3z

zephyr-sys/Cargo.toml

@@ -14,5 +14,5 @@ Zephyr low-level API bindings.
 # used by the core Zephyr tree, but are needed by zephyr applications.
 [build-dependencies]
 anyhow = "1.0"
-bindgen = { version = "0.69.4", features = ["experimental"] }
+bindgen = { version = "0.70.1", features = ["experimental"] }
 # zephyr-build = { version = "3.7.0", path = "../zephyr-build" }