fix: update tool for Capacitor 8 (#25)

The generated Package.swift is still pointing to Capacitor 7, updated it
to use Capacitor 8

Author: jcesarmobile

Sources/CapacitorPluginTools/PackageFileGenerator.swift

@@ -5,7 +5,7 @@ public class PackageFileGenerator {
     let targetName: String
     let capRepoName = "capacitor-swift-pm"
     let capLocation = "https://github.com/ionic-team/capacitor-swift-pm.git"
-    let capVersion = "7.0.0"
+    let capVersion = "8.0.0"
 
     var packageText: String {
         return """

Tests/CapacitorPluginToolsTests/PackageFileGenerator.swift

@@ -27,7 +27,7 @@ struct PackageFileGeneratorTests {
                     targets: ["AppPlugin"])
             ],
             dependencies: [
-                .package(url: "https://github.com/ionic-team/capacitor-swift-pm.git", from: "7.0.0")
+                .package(url: "https://github.com/ionic-team/capacitor-swift-pm.git", from: "8.0.0")
             ],
             targets: [
                 .target(