Update proc-macro-crate requirement from 1 to 2

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](bkchr/proc-macro-crate@v1.2.0...v2.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

enumset_derive/Cargo.toml

@@ -22,4 +22,4 @@ darling = { version = "0.20", default-features = false }
 syn = "2"
 quote = "1"
 proc-macro2 = "1"
-proc-macro-crate = { version = "1", optional = true }
+proc-macro-crate = { version = "2", optional = true }