Bump bindgen to 0.69.4

This is to go in line with other parallaxsecond repositories, in
preparation for the next parsec release.

Signed-off-by: Tomás González <tomasagustin.gonzalezorlando@arm.com>

Author: tgonzalezorlandoarm

Cargo.lock

@@ -12,7 +12,7 @@ repository = "https://github.com/parallaxsecond/rust-psa-crypto"
 rust-version = "1.66.0"
 
 [build-dependencies]
-bindgen = { version = "0.66.1", optional = true }
+bindgen = { version = "0.69.4", optional = true }
 cc = "1.0.59"
 cmake = "0.1.44"
 regex = "1.9.1"