Bump proc-macro-crate from 1.1.3 to 1.2.1 (#1539)

Bumps [proc-macro-crate](https://github.com/bkchr/proc-macro-crate) from 1.1.3 to 1.2.1.
- [Release notes](https://github.com/bkchr/proc-macro-crate/releases)
- [Commits](https://github.com/bkchr/proc-macro-crate/commits/v1.2.1)

---
updated-dependencies:
- dependency-name: proc-macro-crate
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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cumulus/Cargo.lock

@@ -8444,10 +8444,11 @@ dependencies = [
 
 [[package]]
 name = "proc-macro-crate"
-version = "1.1.3"
+version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e17d47ce914bf4de440332250b0edd23ce48c005f59fab39d3335866b114f11a"
+checksum = "eda0fc3b0fb7c975631757e14d9049da17374063edb6ebbcbc54d880d4fe94e9"
 dependencies = [
+ "once_cell",
  "thiserror",
  "toml",
 ]

cumulus/pallets/parachain-system/proc-macro/Cargo.toml

@@ -12,7 +12,7 @@ proc-macro = true
 syn = "1.0.99"
 proc-macro2 = "1.0.42"
 quote = "1.0.21"
-proc-macro-crate = "1.1.3"
+proc-macro-crate = "1.2.1"
 
 [features]
 default = [ "std" ]