Bump syn from 2.0.8 to 2.0.15 (#425)

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.8 to 2.0.15.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](https://github.com/dtolnay/syn/compare/2.0.8...2.0.15)

---
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>

Cargo.lock

@@ -107,7 +107,7 @@ checksum = "86ea188f25f0255d8f92797797c97ebf5631fa88178beb1a46fdf5622c9a00e4"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.8",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -255,7 +255,7 @@ dependencies = [
  "heck",
  "proc-macro2",
  "quote",
- "syn 2.0.8",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -429,7 +429,7 @@ dependencies = [
  "quote",
  "serde",
  "serde_tokenstream",
- "syn 2.0.8",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -1285,7 +1285,7 @@ dependencies = [
  "serde",
  "serde_json",
  "serde_yaml",
- "syn 2.0.8",
+ "syn 2.0.15",
  "thiserror",
  "typify",
  "unicode-ident",
@@ -1304,7 +1304,7 @@ dependencies = [
  "serde_json",
  "serde_tokenstream",
  "serde_yaml",
- "syn 2.0.8",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -1649,7 +1649,7 @@ checksum = "4c614d17805b093df4b147b51339e7e44bf05ef59fba1e45d83500bcfb4d8585"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.8",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -1701,7 +1701,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "serde",
- "syn 2.0.8",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -1857,9 +1857,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.8"
+version = "2.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bcc02725fd69ab9f26eab07fad303e2497fad6fb9eba4f96c4d1687bdf704ad9"
+checksum = "a34fcf3e8b60f57e6a14301a2e916d323af98b0ea63c599441eec8558660c822"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1914,7 +1914,7 @@ checksum = "f9456a42c5b0d803c8cd86e73dd7cc9edd429499f37a3550d286d5e86720569f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.8",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -2164,7 +2164,7 @@ dependencies = [
  "regress",
  "schemars",
  "serde_json",
- "syn 2.0.8",
+ "syn 2.0.15",
  "thiserror",
  "unicode-ident",
 ]
@@ -2180,7 +2180,7 @@ dependencies = [
  "serde",
  "serde_json",
  "serde_tokenstream",
- "syn 2.0.8",
+ "syn 2.0.15",
  "typify-impl",
 ]