cargo: bump syn from 2.0.67 to 2.0.68 in the cargo-dependencies group

Bumps the cargo-dependencies group with 1 update: [syn](https://github.com/dtolnay/syn).


Updates `syn` from 2.0.67 to 2.0.68
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](https://github.com/dtolnay/syn/compare/2.0.67...2.0.68)

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

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

Cargo.lock

@@ -2860,9 +2860,9 @@ checksum = "0d0208408ba0c3df17ed26eb06992cb1a1268d41b2c0e12e65203fbe3972cee5"
 
 [[package]]
 name = "syn"
-version = "2.0.67"
+version = "2.0.68"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ff8655ed1d86f3af4ee3fd3263786bc14245ad17c4c7e85ba7187fb3ae028c90"
+checksum = "901fa70d88b9d6c98022e23b4136f9f3e54e4662c3bc1bd1d84a42a9a0f0c1e9"
 dependencies = [
  "proc-macro2",
  "quote",

Cargo.toml

@@ -90,7 +90,7 @@ smallvec = { version = "1.13.2", features = [
     "union",
 ] }
 strsim = "0.11.1"
-syn = "2.0.67"
+syn = "2.0.68"
 tempfile = "3.10.1"
 test-case = "3.3.1"
 textwrap = "0.16.1"