feat: bump minimum to iOS 16 (#342)

Author: watt

Package.swift

@@ -7,7 +7,7 @@ import PackageDescription
 let package = Package(
     name: "Workflow",
     platforms: [
-        .iOS(.v15),
+        .iOS(.v16),
         .macOS(.v12),
         .watchOS(.v8),
         .macCatalyst(.v15),

Samples/Tuist/ProjectDescriptionHelpers/Project+Workflow.swift

@@ -3,7 +3,7 @@ import ProjectDescription
 
 public let workflowBundleIdPrefix = "com.squareup.workflow"
 public let workflowDestinations: ProjectDescription.Destinations = .iOS
-public let workflowDeploymentTargets: DeploymentTargets = .iOS("15.0")
+public let workflowDeploymentTargets: DeploymentTargets = .iOS("16.0")
 
 extension Target {
     public static func app(