using local action + resolved a warning

Author: goergisn

.github/workflows/detect-api-changes.yml

@@ -56,7 +56,7 @@ jobs:
         noTargetBranch: 'no target branch'
 
     - name: 🔍 Detect Changes
-      uses: ./ # Uses the action.yml that's at the root of the repository
+      uses: ${{ github.repository }}@${{ github.ref }}
       id: public_api_diff
       with:
         platform: "macOS"

Sources/Shared/Package/SwiftPackageFileHelperModule/SwiftPackageFileHelper.swift

@@ -103,7 +103,6 @@ private extension SwiftPackageFileHelper {
 
         let result = try loadPackageDescription(projectDirectoryPath: projectDirectoryPath)
 
-        let newLine = "\n"
         let errorTag = "error: "
         let warningTag = "warning: "