Update cbindgen requirement from ^0.13 to ^0.19

Updates the requirements on cbindgen to permit the latest version.

Release notes

v0.19.0

Simplify types in generics (#663)

Use --profile=check for macro expansion (#671)

Use exported name to prefix enum variants (#672)

Fix path attribute handling in inline submodules (#679)

Fix a stack overflow with some recursive typedefs (#680)

Changelog

Sourced from cbindgen's changelog.

0.19.0

 * Simplify types in generics ([#663](https://github.com/eqrion/cbindgen/issues/663))
 * Use --profile=check for macro expansion ([#671](https://github.com/eqrion/cbindgen/issues/671))
 * Use exported name to prefix enum variants ([#672](https://github.com/eqrion/cbindgen/issues/672))
 * Fix path attribute handling in inline submodules ([#679](https://github.com/eqrion/cbindgen/issues/679))
 * Fix a stack overflow with some recursive typedefs ([#680](https://github.com/eqrion/cbindgen/issues/680))

0.18.0

 * Simplify types in nested types such as pointed-to types and function signatures ([#661](https://github.com/eqrion/cbindgen/issues/661))

0.17.0

 * Add with_parse_extra_bindings to builder. ([#645](https://github.com/eqrion/cbindgen/issues/645))
 * Support NonZero and fix incorrect simplification of Option<ptr> into ptr. ([#647](https://github.com/eqrion/cbindgen/issues/647))
 * Deal with name conflicts correctly in declaration type resolution. ([#651](https://github.com/eqrion/cbindgen/issues/651))
 * Support pointers to ZSTs. ([#656](https://github.com/eqrion/cbindgen/issues/656))

0.16.0

 * Remove artificial restriction on lifetime parameters on enums ([#604](https://github.com/eqrion/cbindgen/issues/604))
 * Add an option for converting usize/isize into size_t/ptrdiff_t. ([#606](https://github.com/eqrion/cbindgen/issues/606))
 * Allow controlling the cargo profile used for expansion. ([#607](https://github.com/eqrion/cbindgen/issues/607))
 * Support wider range of expressions in enum discriminants ([#614](https://github.com/eqrion/cbindgen/issues/614))
 * Support generation of Cython bindings ([#590](https://github.com/eqrion/cbindgen/issues/590))
 * Fixed some issues with style=tag and recursive structs ([#615](https://github.com/eqrion/cbindgen/issues/615))
 * Default C style to Both (as specified in docs) ([#615](https://github.com/eqrion/cbindgen/issues/615))
 * Fix resolution of path dependencies from certain modules. ([#629](https://github.com/eqrion/cbindgen/issues/629))
 * Support inlined definitions for tuple variants with a single field in C ([#631](https://github.com/eqrion/cbindgen/issues/631))

Thanks to all the awesome contributors that contributed to this release.

0.15.0

 * Allow customizing mangling of generic parameters in C ([#575](https://github.com/eqrion/cbindgen/issues/575))
 * Box<T> simplifies to T* in C (4ce324c)
 * ManuallyDrop<T> and MaybeUninit<T> simplify to T in C, and are opaque in C++ (0076a17)
 * C++ supports a derive-ostream annotation to derive serialization of structs, unions and enums ([#582](https://github.com/eqrion/cbindgen/issues/582))
 * Large character constants have been fixed on Windows ([#586](https://github.com/eqrion/cbindgen/issues/586))
 * Constants are now generated for typedefs, etc ([#589](https://github.com/eqrion/cbindgen/issues/589))
 * The `sort_by` configuration option has been made to work for constants ([#587](https://github.com/eqrion/cbindgen/issues/587))
 * Default sort order is source order now (sort_by = "None"), and can be changed by the above option ([#587](https://github.com/eqrion/cbindgen/issues/587))

0.14.6

 * Fixed the builds with older versions of rustc.

0.14.5

... (truncated)

Commits

d9e490c v0.19.0
a9af0ad ir: Tweak monomorphization to instantiate recursively after inserting to the ...
52de917 parser: Fix handling of #[path] attributes inside inline submodules.
54dfcf8 Fix new clippy lint clippy::wrong-self-convention
ccea33e tests: check renaming enum affects variant prefix
5a79d76 bindgen: use exported name for enum prefix
93eed3a union: Fix clippy lint.
2b1907b use --profile=check for macro expansion, fixes #457
aaef260 ir: Simplify types in generics.
a0dc1a1 v0.18.0
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