Update Hummingbird example (#8759)

* Unblock hummingbird version up to latest minor ver

* Remove outdated compiler option

* Run Hummingbird as Swift 6 mode

* Update Package.swift

Co-authored-by: Adam Fowler <[email protected]>

---------

Co-authored-by: Adam Fowler <[email protected]>

Author: ainame

swift/hummingbird-framework/Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.10
+// swift-tools-version:6.0
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
@@ -7,20 +7,14 @@ let package = Package(
     name: "server",
     platforms: [.macOS(.v14)], // This is for development on macOS
     dependencies: [
-        .package(url: "https://github.com/hummingbird-project/hummingbird.git", .upToNextMinor(from: "2.0.0")),
+        .package(url: "https://github.com/hummingbird-project/hummingbird.git", from: "2.16.0"),
     ],
     targets: [
         .executableTarget(
             name: "server",
             dependencies: [
                 .product(name: "Hummingbird", package: "hummingbird"),
             ],
-            swiftSettings: [
-                // Enable better optimizations when building in Release configuration. Despite the use of
-                // the `.unsafeFlags` construct required by SwiftPM, this flag is recommended for Release
-                // builds. See <https://github.com/swift-server/guides#building-for-production> for details.
-                .unsafeFlags(["-cross-module-optimization"], .when(configuration: .release))
-            ]
         ),
     ]
 )