CI is failing due to cargo udeps

[Indy2222]

This command cargo udeps fails with the following error:

error[E0635]: unknown feature `proc_macro_span_shrink`
  --> /home/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.59/src/lib.rs:92:30
   |
92 |     feature(proc_macro_span, proc_macro_span_shrink)
   |                              ^^^^^^^^^^^^^^^^^^^^^^

For more information about this error, try `rustc --explain E0635`.
error: could not compile `proc-macro2` (lib) due to previous error

[JackCrumpLeys]

This issue looks like an issue from updating to newest nightly rustc.
proc-macro2 = "1.0.58" -> proc-macro2 = "1.0.63" in cargo.toml fixes it for me. Opening a PR shortly.