Bump xcodeproj dependency > 8.0.0 and fix Xcode 13.0 buid errors (#39)

Author: kaandedeoglu

Package.resolved

@@ -9,7 +9,7 @@ let package = Package(
         .executable(name: "Shark", targets: ["Shark"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/tuist/xcodeproj.git", .upToNextMajor(from: "7.5.0")),
+        .package(url: "https://github.com/tuist/xcodeproj.git", .upToNextMajor(from: "8.0.0")),
         .package(url: "https://github.com/apple/swift-argument-parser", from: "0.0.1"),
     ],
     targets: [