Let's use Swift 6

Author: mattmassicotte

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 5.8
+// swift-tools-version: 6.0
 
 import PackageDescription
 
@@ -19,13 +19,3 @@ let package = Package(
 		.testTarget(name: "BackgroundTests", dependencies: ["Background"]),
 	]
 )
-
-let swiftSettings: [SwiftSetting] = [
-	.enableExperimentalFeature("StrictConcurrency")
-]
-
-for target in package.targets {
-	var settings = target.swiftSettings ?? []
-	settings.append(contentsOf: swiftSettings)
-	target.swiftSettings = settings
-}