Update ArgumentParser dependency in Package.swift (#1408)

1.2.2 is the version of ArgumentParser used by the toolchain, according to the checkout config: https://github.com/apple/swift/blob/277674a642b058fe95c37e24d5c861c5b81b6a82/utils/update_checkout/update-checkout-config.json#L103

Sticking to the old versions like 1.0.x and 1.1.x has negative downstream effects, since tools using SwiftSyntax (like `swift-format`) are restricted to these versions too, which can easily conflict with other packages.

A more general solution could be to rely on SemVer and use `.upToNextMajor` instead of `.upToNextMinor`.

Author: MaxDesiatov

Package.swift

@@ -219,7 +219,7 @@ let package = Package(
 if ProcessInfo.processInfo.environment["SWIFTCI_USE_LOCAL_DEPS"] == nil {
   // Building standalone.
   package.dependencies += [
-    .package(url: "https://github.com/apple/swift-argument-parser.git", Version("1.0.1")..<Version("1.2.0"))
+    .package(url: "https://github.com/apple/swift-argument-parser.git", .upToNextMinor(from: "1.2.2"))
   ]
 } else {
   package.dependencies += [