fix: update bindgen in fitsio-sys-bindgen

It seems just a version bump was required.

Looks like this PR: rust-lang/rust-bindgen#2203

Author: simonrw

fitsio-sys-bindgen/Cargo.toml

@@ -21,7 +21,7 @@ tempfile = "3.0.0"
 
 [build-dependencies]
 pkg-config = "0.3.7"
-bindgen = "0.59.0"
+bindgen = "0.60.1"
 
 [package.metadata.docs.rs]
 targets = ["x86_64-unknown-linux-gnu"]