Updated swift-syntax package URL (#303)

Author: mjohnson12

Diff for: Package.swift

@@ -60,7 +60,7 @@ let package = Package(
         .package(url: "https://github.com/ReactiveCocoa/ReactiveSwift.git", from: "7.1.1"),
         .package(url: "https://github.com/ReactiveX/RxSwift.git", from: "6.6.0"),
         .package(url: "https://github.com/nicklockwood/SwiftFormat", exact: "0.54.0"),
-        .package(url: "https://github.com/apple/swift-syntax", from: "509.0.0"),
+        .package(url: "https://github.com/swiftlang/swift-syntax", from: "509.0.0"),
         .package(url: "https://github.com/pointfreeco/swift-case-paths", from: "1.1.0"),
         .package(url: "https://github.com/pointfreeco/swift-identified-collections", from: "1.0.0"),
         .package(url: "https://github.com/pointfreeco/swift-macro-testing", from: "0.4.0"),