Loosen swift-system version constraint (#8063)

Loosen version constraint on swift-system

### Motivation:

Allow adoption of build fixes from swift-system-1.4.0 in clients. Does
not update update-checkout at this time

Author: owenv

Package.swift

@@ -955,7 +955,7 @@ if ProcessInfo.processInfo.environment["SWIFTCI_USE_LOCAL_DEPS"] == nil {
         .package(url: "https://github.com/apple/swift-driver.git", branch: relatedDependenciesBranch),
         .package(url: "https://github.com/apple/swift-crypto.git", .upToNextMinor(from: "3.0.0")),
         .package(url: "https://github.com/swiftlang/swift-syntax.git", branch: relatedDependenciesBranch),
-        .package(url: "https://github.com/apple/swift-system.git", "1.1.1" ..< "1.4.0"),
+        .package(url: "https://github.com/apple/swift-system.git", from: "1.1.1"),
         .package(url: "https://github.com/apple/swift-collections.git", "1.0.1" ..< "1.2.0"),
         .package(url: "https://github.com/apple/swift-certificates.git", "1.0.1" ..< "1.6.0"),
         .package(url: "https://github.com/swiftlang/swift-toolchain-sqlite.git", from: "1.0.0"),