Update bindgen requirement from 0.72 to 0.73

[dependabot]

Updates the requirements on bindgen to permit the latest version.

Changelog

Sourced from bindgen's changelog.

0.73.2 (2026-09-08)

Added

Changed

Removed

Fixed

• Fixed various regressions with over/underaligned types with respect to 0.72 (#3449,#3453,#3458).
• Fixed a codegen regression with bitfields with enum types in some circumstances (#3455).

Security

0.73.1 (2026-09-05)

Added

Changed

• Widened acceptable prettyplease / syn dependency versions (#3447).

Removed

Fixed

Security

0.73.0 (2026-09-05)

Added

• Add Debug, Clone and Eq traits to ParseCallbacks info types (#3233).
• Include the source location in discovery ParseCallbacks (#3244).
• Report constants and variables in ParseCallbacks::new_item_found (#3249).
• Allow adding custom attributes to extern function blocks (#3257).
• Support new-type-alias constants (#3288, #3390).
• Support nested flexible array members (#3306).
• Add support for custom per-field attributes (#3307).
• Add const-generic bitfield accessors for compile-time optimization (#3325, #3374).
• Allow renaming struct and union fields (#3358).
• Add a libcpp feature to link libclang against libc++ (#3375).
• Prebuilt binaries for aarch64 Linux (#3217).

Changed

• Guarantee opaque type layout across all architectures (#3280).
• Use NonNull for C++ references (#3292).
• Bindings::write now takes impl Write instead of Box<dyn Write> (#3317, #3324).
• Optimize bitfield unit get/set with byte-wise operations (#3325).
• Emit const __BindgenUnionField accessors and comply with Rust 2024 unsafe_op_in_unsafe_fn (#3337).
• Generate a doc comment pointing at the aliased type when a type alias is hidden (#3122).
• dyngen: convert the library path to OsStr before opening it (#3315).
• Return a NoHeadersProvided error instead of generating empty bindings when no input headers are provided (#3391).
• Bump the MSRV to 1.71 (#3401).
• Bump syn to v3 (#3401) and shlex to v2 (#3380).

Removed

• Removed support for generating code for rustc versions < 1.51, along with

... (truncated)

Commits

• 73c69d6 chore: Release
• 77cbc72 codegen: Pad bitfields to field offset if applicable.
• dc61531 ty: More struct layout fixes for overaligned integers / aliases.
• 4348523 codegen: Revert some bitfield codegen changes and silence unnecessary_transmu...
• efb6e0c ty: Use underlying layout of typedefs if available.
• 18fc3ac codegen: Simplify bitfield merging code.
• 910679f codegen: Remove hack that is no longer needed now that we have repr(align) ev...
• 38ebc48 codegen: Don't force padding to be aligned.
• 64f0939 codegen: Don't force padding for over-aligned fields.
• cf8faab codegen: Simplify some conditions about repr(align).
• Additional commits viewable in compare view

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