add .git extensions to dependency URLs (#770)

This PR adds .git extensions to the Swift Package Manager dependencies
that didn't include them. For me, this resolves issues that I have had
with an error produced by Xcode when updating to the latest package
versions if I'm editing the project which depends on AHC in an Xcode
Workspace.

<img width="389" alt="image"
src="https://github.com/user-attachments/assets/24c3a5de-b555-4da8-a2fa-a4673fecff44">

The complete error is: `github.com:
https://github.com/apple/swift-algorithms: The repository could not be
found. Make sure a valid repository exists at the specified location and
try again.`

Based on conversations in the Vapor Discord server, adding these
extensions "shouldn't" make a difference to the dependency resolution
done by swift package manager, however adding them resolves the error. 🤷

Co-authored-by: Franz Busch <f.busch@apple.com>

Author: daSkier

Package.swift

@@ -28,8 +28,8 @@ let package = Package(
         .package(url: "https://github.com/apple/swift-nio-transport-services.git", from: "1.19.0"),
         .package(url: "https://github.com/apple/swift-log.git", from: "1.4.4"),
         .package(url: "https://github.com/apple/swift-atomics.git", from: "1.0.2"),
-        .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0"),
-        .package(url: "https://github.com/apple/swift-algorithms", from: "1.0.0"),
+        .package(url: "https://github.com/apple/swift-docc-plugin.git", from: "1.0.0"),
+        .package(url: "https://github.com/apple/swift-algorithms.git", from: "1.0.0"),
     ],
     targets: [
         .target(