Bump syn from 1.0.90 to 1.0.91 (#5273)

Bumps [syn](https://github.com/dtolnay/syn) from 1.0.90 to 1.0.91.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](https://github.com/dtolnay/syn/compare/1.0.90...1.0.91)

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

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

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

polkadot/Cargo.lock

@@ -11103,9 +11103,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.90"
+version = "1.0.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "704df27628939572cd88d33f171cd6f896f4eaca85252c6e0a72d8d8287ee86f"
+checksum = "b683b2b825c8eef438b77c36a06dc262294da3d5a5813fac20da149241dcd44d"
 dependencies = [
  "proc-macro2",
  "quote",

polkadot/node/gum/proc-macro/Cargo.toml

@@ -12,7 +12,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 proc-macro = true
 
 [dependencies]
-syn = { version = "1.0.90", features = ["full", "extra-traits"] }
+syn = { version = "1.0.91", features = ["full", "extra-traits"] }
 quote = "1.0.17"
 proc-macro2 = "1.0.36"
 proc-macro-crate = "1.1.3"

polkadot/node/overseer/overseer-gen/proc-macro/Cargo.toml

@@ -12,7 +12,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 proc-macro = true
 
 [dependencies]
-syn = { version = "1.0.90", features = ["full", "extra-traits"] }
+syn = { version = "1.0.91", features = ["full", "extra-traits"] }
 quote = "1.0.17"
 proc-macro2 = "1.0.36"
 proc-macro-crate = "1.1.3"

polkadot/xcm/procedural/Cargo.toml

@@ -10,5 +10,5 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1.0.36"
 quote = "1.0.17"
-syn = "1.0.90"
+syn = "1.0.91"
 Inflector = "0.11.4"