Updating to bingen v0.71.1 return an error regarding to proc-marco2

[ifraixedes]

I tried to update the uplink-sys to Bindgen v0.71.1 and I got the following error

error[E0599]: no function or associated item named `c_string` found for struct `proc_macro2::Literal` in the current scope
    --> /home/ivan/persistent/rust/cargo/registry/src/index.crates.io-1949cf8c6b5b557f/bindgen-0.71.1/codegen/mod.rs:734:62
     |
734  | ...                   let cstr = proc_macro2::Literal::c_string(cstr);
     |                                                        ^^^^^^^^ function or associated item not found in `Literal`
     |
note: if you're trying to build a new `proc_macro2::Literal` consider using one of the following associated functions:
      proc_macro2::Literal::u8_suffixed
      proc_macro2::Literal::u16_suffixed
      proc_macro2::Literal::u32_suffixed
      proc_macro2::Literal::u64_suffixed
      and 28 others
    --> /home/ivan/persistent/rust/cargo/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.68/src/lib.rs:1096:5
     |
1096 | /     suffixed_int_literals! {
1097 | |         u8_suffixed => u8,
1098 | |         u16_suffixed => u16,
1099 | |         u32_suffixed => u32,
...    |
1108 | |         isize_suffixed => isize,
1109 | |     }
     | |_____^
     = note: this error originates in the macro `suffixed_int_literals` (in Nightly builds, run with -Z macro-backtrace for more info)
help: there is an associated function `string` with a similar name
     |
734  -                             let cstr = proc_macro2::Literal::c_string(cstr);
734  +                             let cstr = proc_macro2::Literal::string(cstr);
     |

For more information about this error, try `rustc --explain E0599`.

As far as I could see, proc-marco2 is installed with an older version of one that has that method available. I tried to update to v0.70.1 and was fine.

The only way I found to fix it was to add the proc-macro2 in the build-dependencies alongside the bindgen one, however, I don't know if that's the solution or a workaround.

I use Rust stable, and uplink-sys crate doesn't have any explicit dependencies https://github.com/storj-thirdparty/uplink-rust/blob/main/uplink-sys/Cargo.toml#L24

Thank you for your help.