Update dependency vapor/leaf to from: "4.5.1" (#499)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Package.swift

@@ -9,7 +9,7 @@ let package = Package(
   dependencies: [
     .package(url: "https://github.com/kishikawakatsumi/swift-experimental-string-processing.git", branch: "metrics"),
     .package(url: "https://github.com/vapor/vapor.git", from: "4.115.1"),
-    .package(url: "https://github.com/vapor/leaf.git", from: "4.5.0"),
+    .package(url: "https://github.com/vapor/leaf.git", from: "4.5.1"),
   ],
   targets: [
     .executableTarget(