Bump syn from 2.0.14 to 2.0.15

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.14 to 2.0.15.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@2.0.14...2.0.15)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -12,7 +12,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 proc-macro = true
 
 [dependencies]
-syn = { version = "2.0.14", features = ["full", "extra-traits"] }
+syn = { version = "2.0.15", features = ["full", "extra-traits"] }
 quote = "1.0.26"
 proc-macro2 = "1.0.56"
 proc-macro-crate = "1.1.3"

node/gum/proc-macro/Cargo.toml

@@ -10,5 +10,5 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1.0.56"
 quote = "1.0.26"
-syn = "2.0.14"
+syn = "2.0.15"
 Inflector = "0.11.4"