Fix Task.sleep deprecation warnings (#911)

Author: stephencelis

Examples/CaseStudies/SwiftUICaseStudies/FactClient.swift

@@ -21,7 +21,7 @@ extension FactClient {
               .data(from: URL(string: "http://numbersapi.com/\(number)/trivia")!)
             return String(decoding: data, as: UTF8.self)
           } catch {
-            await Task.sleep(NSEC_PER_SEC)
+            try? await Task.sleep(nanoseconds: NSEC_PER_SEC)
             return "\(number) is a good number Brent"
           }
         }

Tests/ComposableArchitectureTests/EffectTests.swift

@@ -258,7 +258,7 @@ final class EffectTests: XCTestCase {
       @Sendable func work() async throws -> Int {
         var task: Task<Int, Error>!
         task = Task {
-          await Task.sleep(NSEC_PER_MSEC)
+          try? await Task.sleep(nanoseconds: NSEC_PER_MSEC)
           try Task.checkCancellation()
           return 42
         }