Drop support for Swift 5.9 (#549)

Author: fabianfett

.github/workflows/test.yml

@@ -18,9 +18,9 @@ jobs:
       fail-fast: false
       matrix:
         swift-image:
-          - swift:5.9-jammy
-          - swift:5.10-noble
+          - swift:5.10-jammy
           - swift:6.0-noble
+          - swift:6.1-noble
           - swiftlang/swift:nightly-main-jammy
     container: ${{ matrix.swift-image }}
     runs-on: ubuntu-latest
@@ -58,7 +58,7 @@ jobs:
           - postgres-image: postgres:12
             postgres-auth: trust
     container:
-      image: swift:5.10-noble
+      image: swift:6.1-noble
       volumes: [ 'pgrunshare:/var/run/postgresql' ]
     runs-on: ubuntu-latest
     env:

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.9
+// swift-tools-version:5.10
 import PackageDescription
 
 let swiftSettings: [SwiftSetting] = [

Sources/ConnectionPoolModule/ConnectionPool.swift

@@ -273,13 +273,11 @@ public final class ConnectionPool<
 
     public func run() async {
         await withTaskCancellationHandler {
-            #if os(Linux) || compiler(>=5.9)
             if #available(macOS 14.0, iOS 17.0, tvOS 17.0, watchOS 10.0, *) {
                 return await withDiscardingTaskGroup() { taskGroup in
                     await self.run(in: &taskGroup)
                 }
             }
-            #endif
             return await withTaskGroup(of: Void.self) { taskGroup in
                 await self.run(in: &taskGroup)
             }
@@ -313,14 +311,12 @@ public final class ConnectionPool<
         case scheduleTimer(StateMachine.Timer)
     }
 
-    #if os(Linux) || compiler(>=5.9)
     @available(macOS 14.0, iOS 17.0, tvOS 17.0, watchOS 10.0, *)
     private func run(in taskGroup: inout DiscardingTaskGroup) async {
         for await event in self.eventStream {
             self.runEvent(event, in: &taskGroup)
         }
     }
-    #endif
 
     private func run(in taskGroup: inout TaskGroup<Void>) async {
         var running = 0
@@ -507,11 +503,7 @@ public final class ConnectionPool<
             await withTaskGroup(of: TimerRunResult.self, returning: Void.self) { taskGroup in
                 taskGroup.addTask {
                     do {
-                        #if os(Linux) || compiler(>=5.9)
                         try await self.clock.sleep(for: timer.duration)
-                        #else
-                        try await self.clock.sleep(until: self.clock.now.advanced(by: timer.duration), tolerance: nil)
-                        #endif
                         return .timerTriggered
                     } catch {
                         return .timerCancelled
@@ -579,15 +571,13 @@ protocol TaskGroupProtocol {
     mutating func addTask_(operation: @escaping @Sendable () async -> Void)
 }
 
-#if os(Linux) || swift(>=5.9)
 @available(macOS 14.0, iOS 17.0, tvOS 17.0, watchOS 10.0, *)
 extension DiscardingTaskGroup: TaskGroupProtocol {
     @inlinable
     mutating func addTask_(operation: @escaping @Sendable () async -> Void) {
         self.addTask(priority: nil, operation: operation)
     }
 }
-#endif
 
 extension TaskGroup<Void>: TaskGroupProtocol {
     @inlinable