Upgrades to vips v8.13.3 and bindgen 0.63.0

[BogdanVidrean]

Just like the name of the PR suggests, it upgrades this crate to libvips 8.13.3 and generates the bindings using bindgen 0.63.0.

[bassco]

Please remove the following unreachable code.

warning: unreachable expression
   --> src/lib.rs:114:13
    |
113 |             bindings::vips_error_exit(c_str_error.as_ptr());
    |             ----------------------------------------------- any code following this expression is unreachable
114 |             Ok(())
    |             ^^^^^^ unreachable expression
    |
    = note: `#[warn(unreachable_code)]` on by default```