Drop support for 5.8

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.8
+// swift-tools-version:5.9
 import PackageDescription
 
 let package = Package(
@@ -13,7 +13,7 @@ let package = Package(
         .library(name: "Fluent", targets: ["Fluent"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/vapor/fluent-kit.git", from: "1.48.4"),
+        .package(url: "https://github.com/vapor/fluent-kit.git", from: "1.49.0"),
         .package(url: "https://github.com/vapor/vapor.git", from: "4.101.0"),
     ],
     targets: [
@@ -38,6 +38,10 @@ let package = Package(
 )
 
 var swiftSettings: [SwiftSetting] { [
+    .enableUpcomingFeature("ExistentialAny"),
     .enableUpcomingFeature("ConciseMagicFile"),
     .enableUpcomingFeature("ForwardTrailingClosures"),
+    .enableUpcomingFeature("ImportObjcForwardDeclarations"),
+    .enableUpcomingFeature("DisableOutwardActorInference"),
+    .enableExperimentalFeature("StrictConcurrency=complete"),
 ] }