[stdlib] Make PlatformExecutorFactory and ExecutorFactory deploy to 6.3 instead of 6.2.

This code is public on main, but not on 6.2, so if one compiles a binary for 6.2
on main and then attempts to use a stdlib from a 6.2 aligned macOS, one gets an
ABI error since the type isn't there. Just mark these types as being available
in 6.3 so that way this is future proofed and allows for main binaries to run
against a 6.2 aligned macOS stdlib.

Author: gottesmm

stdlib/public/Concurrency/Executor.swift

@@ -591,7 +591,7 @@ public protocol MainExecutor: RunLoopExecutor, SerialExecutor {
 
 /// An ExecutorFactory is used to create the default main and task
 /// executors.
-@available(StdlibDeploymentTarget 6.2, *)
+@available(StdlibDeploymentTarget 6.3, *)
 public protocol ExecutorFactory {
   #if os(WASI) || !$Embedded
   /// Constructs and returns the main executor, which is started implicitly
@@ -604,7 +604,7 @@ public protocol ExecutorFactory {
   static var defaultExecutor: any TaskExecutor { get }
 }
 
-@available(StdlibDeploymentTarget 6.2, *)
+@available(StdlibDeploymentTarget 6.3, *)
 typealias DefaultExecutorFactory = PlatformExecutorFactory
 
 @available(StdlibDeploymentTarget 6.2, *)

stdlib/public/Concurrency/PlatformExecutorCooperative.swift

@@ -13,7 +13,7 @@
 import Swift
 
 // This platform uses a single, global, CooperativeExecutor
-@available(StdlibDeploymentTarget 6.2, *)
+@available(StdlibDeploymentTarget 6.3, *)
 public struct PlatformExecutorFactory: ExecutorFactory {
   static let executor = CooperativeExecutor()
   public static var mainExecutor: any MainExecutor { executor }

stdlib/public/Concurrency/PlatformExecutorDarwin.swift

@@ -14,7 +14,7 @@
 
 import Swift
 
-@available(StdlibDeploymentTarget 6.2, *)
+@available(StdlibDeploymentTarget 6.3, *)
 public struct PlatformExecutorFactory: ExecutorFactory {
   public static var mainExecutor: any MainExecutor {
     if CoreFoundation.isPresent {

stdlib/public/Concurrency/PlatformExecutorFreeBSD.swift

@@ -15,7 +15,7 @@
 import Swift
 
 // The default executors for now are Dispatch-based
-@available(SwiftStdlib 6.2, *)
+@available(SwiftStdlib 6.3, *)
 public struct PlatformExecutorFactory: ExecutorFactory {
   public static let mainExecutor: any MainExecutor = DispatchMainExecutor()
   public static let defaultExecutor: any TaskExecutor

stdlib/public/Concurrency/PlatformExecutorLinux.swift

@@ -15,7 +15,7 @@
 import Swift
 
 // The default executors for now are Dispatch-based
-@available(StdlibDeploymentTarget 6.2, *)
+@available(StdlibDeploymentTarget 6.3, *)
 public struct PlatformExecutorFactory: ExecutorFactory {
   public static let mainExecutor: any MainExecutor = DispatchMainExecutor()
   public static let defaultExecutor: any TaskExecutor

stdlib/public/Concurrency/PlatformExecutorNone.swift

@@ -12,7 +12,7 @@
 
 import Swift
 
-@available(StdlibDeploymentTarget 6.2, *)
+@available(StdlibDeploymentTarget 6.3, *)
 public struct PlatformExecutorFactory: ExecutorFactory {
   public static let mainExecutor: any MainExecutor = UnimplementedMainExecutor()
   public static let defaultExecutor: any TaskExecutor = UnimplementedTaskExecutor()

stdlib/public/Concurrency/PlatformExecutorOpenBSD.swift

@@ -15,7 +15,7 @@
 import Swift
 
 // The default executors for now are Dispatch-based
-@available(SwiftStdlib 6.2, *)
+@available(SwiftStdlib 6.3, *)
 public struct PlatformExecutorFactory: ExecutorFactory {
   public static let mainExecutor: any MainExecutor = DispatchMainExecutor()
   public static let defaultExecutor: any TaskExecutor

stdlib/public/Concurrency/PlatformExecutorWindows.swift

@@ -15,7 +15,7 @@
 import Swift
 
 // The default executors for now are Dispatch-based
-@available(StdlibDeploymentTarget 6.2, *)
+@available(StdlibDeploymentTarget 6.3, *)
 public struct PlatformExecutorFactory: ExecutorFactory {
   public static let mainExecutor: any MainExecutor = DispatchMainExecutor()
   public static let defaultExecutor: any TaskExecutor =