switch Poly versioning to 'upToNextMajor' and updated the resolved version.

Package.resolved

@@ -6,8 +6,8 @@
         "repositoryURL": "https://github.com/mattpolzin/Poly.git",
         "state": {
           "branch": null,
-          "revision": "d24d4c1214dd05f89eb1182a46592856dd0a0645",
-          "version": "2.0.0"
+          "revision": "38051821d7ef49e590e26e819a2fe447e50be9ff",
+          "version": "2.0.1"
         }
       }
     ]

Package.swift

@@ -18,7 +18,7 @@ let package = Package(
 			targets: ["JSONAPITesting"])
     ],
     dependencies: [
-		.package(url: "https://github.com/mattpolzin/Poly.git", from: "2.0.0"),
+		.package(url: "https://github.com/mattpolzin/Poly.git", .upToNextMajor(from: "2.0.0")),
     ],
     targets: [
         .target(