cbindgen: upgrade 0.28.0 -> 0.29.2

Drop patch that is incorporated in this release.

Changelog:

0.29.2
 * Request serde's std feature to avoid issues with newer toml versions.

0.29.1
 * enum: Track dependencies properly in enumerations.
 * constant: Handle cfg in associated constants.
 * Remove "display" feature from the toml crate
 * Fix incorrect detection of duplicated constants
 * docs: Correct after_include type in example config (fix)
 * cargo update
 * Update toml to 0.9

0.29.0
 * Support no-export annotation for statics and functions.
 * Fixed conditional fields of constexpr literal structs
 * Add rename rule for generated associated constant
 * Upgrade heck to 0.5
 * Add support for an optional nullable attribute
 * docs.md: Fix deprecated_with_note and deprecated_variant_with_note being spelled as 'notes'
 * Fix generic with "void" default
 * Fixed error generation of structures using the keyword as inside arrays
 * Added test for unsafe(no_mangle) attribute
 * Fixed handling of trait methods containing the unsafe attribute
 * Rename -Zparse-only

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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