chore(deps): update proc-macro-crate requirement from 2 to 3 (#1269)

Updates the requirements on [proc-macro-crate](https://github.com/bkchr/proc-macro-crate) to permit the latest version.
- [Release notes](https://github.com/bkchr/proc-macro-crate/releases)
- [Commits](https://github.com/bkchr/proc-macro-crate/commits)

---
updated-dependencies:
- dependency-name: proc-macro-crate
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

proc-macros/Cargo.toml

@@ -20,7 +20,7 @@ proc-macro = true
 proc-macro2 = "1.0"
 quote = "1.0"
 syn = { version = "1.0", default-features = false, features = ["extra-traits", "full", "visit", "parsing", "printing", "clone-impls", "proc-macro"] }
-proc-macro-crate = "2"
+proc-macro-crate = "3"
 heck = "0.4.0"
 
 [dev-dependencies]