Real dependencies (pointfreeco#74)

* Move XCTestDynamicOverlay to real place of use

* Remove unused dependencies

Author: vincentisambart

Package.swift

@@ -30,17 +30,15 @@ let package = Package(
     .target(
       name: "_SwiftUINavigationState",
       dependencies: [
-        .product(name: "CasePaths", package: "swift-case-paths"),
         .product(name: "CustomDump", package: "swift-custom-dump"),
+        .product(name: "XCTestDynamicOverlay", package: "xctest-dynamic-overlay"),
       ]
     ),
     .target(
       name: "SwiftUINavigation",
       dependencies: [
         "_SwiftUINavigationState",
         .product(name: "CasePaths", package: "swift-case-paths"),
-        .product(name: "CustomDump", package: "swift-custom-dump"),
-        .product(name: "XCTestDynamicOverlay", package: "xctest-dynamic-overlay"),
       ]
     ),
     .testTarget(