Bump proc-macro2 from 1.0.49 to 1.0.50 (#2130)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.49 to 1.0.50.
- [Release notes](https://github.com/dtolnay/proc-macro2/releases)
- [Commits](https://github.com/dtolnay/proc-macro2/compare/1.0.49...1.0.50)

---
updated-dependencies:
- dependency-name: proc-macro2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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cumulus/Cargo.lock

@@ -8990,9 +8990,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.49"
+version = "1.0.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "57a8eca9f9c4ffde41714334dee777596264c7825420f521abc92b5b5deb63a5"
+checksum = "6ef7d57beacfaf2d8aee5937dab7b7f28de3cb8b1828479bb5de2a7106f2bae2"
 dependencies = [
  "unicode-ident",
 ]

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

@@ -10,7 +10,7 @@ proc-macro = true
 
 [dependencies]
 syn = "1.0.107"
-proc-macro2 = "1.0.49"
+proc-macro2 = "1.0.50"
 quote = "1.0.23"
 proc-macro-crate = "1.3.0"