Cargo.toml: Update to bindgen 0.72.1

[drinkcat]

Submission Checklist 📝

• I have updated existing examples or added new ones (if applicable).
• I have used cargo fmt command to ensure that all changed code is formatted correctly.
• I have used cargo clippy command to ensure that all changed code passes latest Clippy nightly lints.
• My changes were added to the CHANGELOG.md in the proper section.

Pull Request Details 📖

Description

Needed for a potential MR on esp-idf-sys, probably good practice anyway.

Testing

With a pending branch where I use BindgenCallbacks::modify_macro.

[jarovo]

With old bindgen (0.71.1) I was getting:

(venv) jhenner@veverka:~/projects/esp-idf-svc$ LIBCLANG_PATH=/usr/lib64/llvm22/lib64/ MCU=esp32c5 cargo +nightly build -Zbuild-std --target riscv32imac-esp-espidf --example wifi_async_dpp
    Blocking waiting for file lock on package cache
    Updating crates.io index
    Blocking waiting for file lock on package cache
    Blocking waiting for file lock on package cache
    Blocking waiting for file lock on package cache
    Blocking waiting for file lock on package cache
   Compiling esp-idf-hal v0.46.2 (/home/jhenner/projects/esp-idf-hal)
   Compiling esp-idf-svc v0.52.1 (/home/jhenner/projects/esp-idf-svc)
error[E0422]: cannot find struct, variant or union type `spi_transaction_t__bindgen_ty_1` in this scope
     --> /home/jhenner/projects/esp-idf-hal/src/spi.rs:2009:27
      |
 2009 |         __bindgen_anon_1: spi_transaction_t__bindgen_ty_1 {
      |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      ```
      
 Bumping it to 0.72.1 seems have fixed the issue.

[ivmarkov]

I'll merge this at some point, but after the current patch release, because bumping bindgen minor version means bumping embuild's minor version too (bindgen is an API) which in turns means bumping the minor versions of the sys/hal/svc crates...