chore: update from apple to swiftlang repository for DocC plugin

Author: FabrizioBrancati

Package.resolved

@@ -41,7 +41,7 @@ let package = Package(
         .library(name: "Queuer", targets: ["Queuer"])
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.3.0")
+        .package(url: "https://github.com/swiftlang/swift-docc-plugin", from: "1.4.0")
     ],
     targets: [
         .target(name: "Queuer", swiftSettings: [