Bump argument parser dep to 1.6.1

Package.swift

@@ -7,7 +7,7 @@ let package = Package(
     .macOS(.v13),
   ],
   dependencies: [
-    .package(url: "https://github.com/apple/swift-argument-parser", from: "1.5.0"),
+    .package(url: "https://github.com/apple/swift-argument-parser", from: "1.6.1"),
   ],
   targets: [
     .target(

Sources/apk/Index/ApkIndexReader.swift

@@ -8,7 +8,7 @@ import Foundation
 public struct ApkIndexReader {
   static func read(from indexURL: URL) throws -> ApkIndex {
     let timed = false
-    var timer: ContinuousClock.Instant
+    var timer: ContinuousClock.Instant!
     let durFormat = Duration.UnitsFormatStyle(
       allowedUnits: [ .seconds, .milliseconds ],
       width: .condensedAbbreviated,