Automatically open a PR to bump the calver (#4167)

* Update our tools package to Swift 6.1

Also improves the package layout with subdirectories 📁

* Update GenerateSDKMocks to be an Async command.

* Add a tool to bump the project CalVer every month.

* Add a workflow to automatically bump the calendar version.

Note: This only does year & month, the patch is handled by the release script.

Tools/Sources/Commands/OutdatedPackages.swift

@@ -0,0 +1,24 @@
+import ArgumentParser
+import CommandLineTools
+import Foundation
+
+struct OutdatedPackages: ParsableCommand {
+    static let configuration = CommandConfiguration(abstract: "A tool to check outdated package dependencies. Please make sure you have already run setup-project before using this tool.")
+
+    private var projectSwiftPMDirectoryURL: URL { .projectDirectory.appendingPathComponent("ElementX.xcodeproj/project.xcworkspace/xcshareddata/swiftpm") }
+
+    func run() throws {
+        try checkToolsDependencies()
+        try checkProjectDependencies()
+    }
+
+    func checkToolsDependencies() throws {
+        guard let output = try Zsh.run(command: "swift outdated"), !output.isEmpty else { return }
+        print("outdated tools Swift packages:\n\(output)")
+    }
+
+    func checkProjectDependencies() throws {
+        guard let output = try Zsh.run(command: "swift outdated", directory: projectSwiftPMDirectoryURL), !output.isEmpty else { return }
+        print("outdated project Swift packages:\n\(output)")
+    }
+}