Fix Swift 6.x warnings (#93)

Fixes #92

Author: keith

.github/workflows/swift.yml

@@ -8,11 +8,11 @@ name: Swift
 
 jobs:
   build:
-    runs-on: macos-13
+    runs-on: macos-14
     steps:
       - uses: actions/checkout@v3
       - name: xcode-select
-        run: sudo xcode-select -s /Applications/Xcode_15.0.app
+        run: sudo xcode-select -s /Applications/Xcode_16.2.app
       - name: Build
         run: swift build -Xswiftc -warnings-as-errors
       - name: Test

Sources/RemindersLibrary/EKReminder+Encodable.swift

@@ -1,6 +1,6 @@
 import EventKit
 
-extension EKReminder: Encodable {
+extension EKReminder: @retroactive Encodable {
     private enum EncodingKeys: String, CodingKey {
         case externalId
         case lastModified

Sources/RemindersLibrary/NaturalLanguage.swift

@@ -44,7 +44,7 @@ private func components(from string: String) -> DateComponents? {
     }
 }
 
-extension DateComponents: ExpressibleByArgument {
+extension DateComponents: @retroactive ExpressibleByArgument {
       public init?(argument: String) {
           if let components = components(from: argument) {
               self = components