Update dependency vapor/leaf to from: "4.2.1"

Author: renovate[bot]

Package.swift

@@ -8,7 +8,7 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/vapor/vapor.git", from: "4.65.0"),
-        .package(url: "https://github.com/vapor/leaf.git", from: "4.2.0"),
+        .package(url: "https://github.com/vapor/leaf.git", from: "4.2.1"),
         .package(url: "https://github.com/apple/swift-format.git", from: "0.50600.1"),
     ],
     targets: [