build: remove package-benchmark from the dependencies

This package is not very Windows friendly. A partial port was attempted
but revealed further Unixisms that will be difficult to port. There are
alternative packages for benchmarking, e.g. google/swift-benchmark which
may be a better choice.

Author: compnerd

Package.swift

@@ -139,7 +139,7 @@ let package = Package(
   dependencies: [
     .package(url: "https://github.com/swiftlang/swift-syntax.git", branch: "main"),
     .package(url: "https://github.com/apple/swift-argument-parser", from: "1.5.0"),
-    .package(url: "https://github.com/ordo-one/package-benchmark", .upToNextMajor(from: "1.4.0")),
+    // .package(url: "https://github.com/ordo-one/package-benchmark", .upToNextMajor(from: "1.4.0")),
   ],
   targets: [
     .macro(