build: update swift-argument-parser dependency

Update the dependency to match the version in update-checkout for
standalone builds.

Author: compnerd

Package.swift

@@ -1100,7 +1100,7 @@ if ProcessInfo.processInfo.environment["SWIFTCI_USE_LOCAL_DEPS"] == nil {
         // The 'swift-argument-parser' version declared here must match that
         // used by 'swift-driver' and 'sourcekit-lsp'. Please coordinate
         // dependency version changes here with those projects.
-        .package(url: "https://github.com/apple/swift-argument-parser.git", .upToNextMinor(from: "1.4.0")),
+        .package(url: "https://github.com/apple/swift-argument-parser.git", .upToNextMinor(from: "1.5.1")),
         .package(url: "https://github.com/swiftlang/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),