Relax minimum platforms

to macOS 10.15, iOS 13, tvOS 13, and watchOS 6

Author: adam-fowler

Package.swift

@@ -6,13 +6,13 @@ import PackageDescription
 let package = Package(
     name: "swift-openapi-hummingbird",
     platforms: [
-        .macOS(.v13), .iOS(.v16), .tvOS(.v16), .watchOS(.v9),
+        .macOS(.v10_15), .iOS(.v13), .tvOS(.v13), .watchOS(.v6),
     ],
     products: [
         .library(name: "OpenAPIHummingbird", targets: ["OpenAPIHummingbird"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-openapi-runtime", .upToNextMinor(from: "0.1.0")),
+        .package(url: "https://github.com/apple/swift-openapi-runtime", .upToNextMinor(from: "0.1.3")),
         .package(url: "https://github.com/hummingbird-project/hummingbird", from: "1.0.0"),
     ],
     targets: [