More fixes for Swift 6

Author: fabianfett

Sources/AWSLambdaRuntimeCore/Lambda.swift

@@ -60,7 +60,7 @@ public enum Lambda {
     }
 
     /// The default EventLoop the Lambda is scheduled on.
-    public static var defaultEventLoop: any EventLoop = NIOSingletons.posixEventLoopGroup.next()
+    public static let defaultEventLoop: any EventLoop = NIOSingletons.posixEventLoopGroup.next()
 }
 
 // MARK: - Public API

Sources/AWSLambdaRuntimeCore/LambdaHandlers.swift

@@ -193,7 +193,7 @@ extension LambdaRuntime {
     >(
         encoder: Encoder,
         decoder: Decoder,
-        body: @escaping (Event, LambdaContext) async throws -> Output
+        body: sending @escaping (Event, LambdaContext) async throws -> Output
     )
     where
         Handler == LambdaCodableAdapter<
@@ -219,7 +219,7 @@ extension LambdaRuntime {
     /// - Parameter decoder: The decoder object that will be used to decode the incoming ``ByteBuffer`` event into the generic ``Event`` type.
     public convenience init<Event: Decodable, Decoder: LambdaEventDecoder>(
         decoder: Decoder,
-        body: @escaping (Event, LambdaContext) async throws -> Void
+        body: sending @escaping (Event, LambdaContext) async throws -> Void
     )
     where
         Handler == LambdaCodableAdapter<

Sources/AWSLambdaRuntimeCore/LambdaRequestID.swift

@@ -88,15 +88,16 @@ struct LambdaRequestID {
     }
 
     /// thread safe secure random number generator.
-    private static var generator = SystemRandomNumberGenerator()
     private static func generateRandom() -> Self {
+        var generator = SystemRandomNumberGenerator()
+
         var _uuid: uuid_t = LambdaRequestID.null
         // https://tools.ietf.org/html/rfc4122#page-14
         // o  Set all the other bits to randomly (or pseudo-randomly) chosen
         //    values.
         withUnsafeMutableBytes(of: &_uuid) { ptr in
-            ptr.storeBytes(of: Self.generator.next(), toByteOffset: 0, as: UInt64.self)
-            ptr.storeBytes(of: Self.generator.next(), toByteOffset: 8, as: UInt64.self)
+            ptr.storeBytes(of: generator.next(), toByteOffset: 0, as: UInt64.self)
+            ptr.storeBytes(of: generator.next(), toByteOffset: 8, as: UInt64.self)
         }
 
         // o  Set the four most significant bits (bits 12 through 15) of the