Merge fortanix#273

273: Update bindgen to latest version (0.65.1) to fix "not a valid Ident" error r=Taowyoo a=sburton84

Trying to build `mbedtls-sys-auto` on my machine was resulting in the following error:
```
  thread 'main' panicked at '"x509_san_other_name_union_(unnamed_at_vendor/include/mbedtls/x509_crt_h_115_5)" is not a valid Ident', /home/sburton/.cargo/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.58/src/fallback.rs:811:9
```

I'm not sure exactly what change on my machine causes this, it fails even when using the same rustc version as previously worked, could possibly be related to updating installed LLVM version?

Regardless, updating the `bindgen` version being used fixes the issue. This PR just updates `bindgen` (plus changes the call to `rustfmt_bindings` which has been deprecated).

Co-authored-by: Sean Burton <[email protected]>

Author: bors[bot]