Update dependency swiftlang/swift-syntax to v604 (#6186)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Components/BuildExtensions/Package.resolved

@@ -6,8 +6,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/swiftlang/swift-syntax",
       "state" : {
-        "revision" : "79e4b74a295b6eb74a8b585e3a39d29e70c1dbd1",
-        "version" : "603.0.2"
+        "revision" : "050f1a346fbbac0ca2cfb15a95274f7bd1cf0ccf",
+        "version" : "604.0.0"
       }
     }
   ],

Components/BuildExtensions/Package.swift

@@ -13,7 +13,7 @@ let package = Package(
         .library(name: "Macros", targets: ["Macros"])
     ],
     dependencies: [
-        .package(url: "https://github.com/swiftlang/swift-syntax", from: "603.0.2")
+        .package(url: "https://github.com/swiftlang/swift-syntax", from: "604.0.0")
     ],
     targets: [
         // The public macro declarations imported by the app.