fix: replace local paths with GitHub URLs for dependencies

Author: coenttb

Package.swift

@@ -25,8 +25,8 @@ let package = Package(
         ),
     ],
     dependencies: [
-        .package(path: "../swift-rfc-2822"),
-        .package(path: "../swift-rfc-3987")
+        .package(url: "https://github.com/swift-standards/swift-rfc-2822.git", from: "0.1.0"),
+        .package(url: "https://github.com/swift-standards/swift-rfc-3987.git", from: "0.1.0")
     ],
     targets: [
         .target(