Fix indentation in GitHub Actions workflow (#905)

Author: sbooth

.github/workflows/swift.yml

@@ -10,13 +10,13 @@ jobs:
   build:
     runs-on: macos-latest
     steps:
-    - name: Set Xcode version
-      uses: maxim-lobanov/setup-xcode@v1
-      with:
-        xcode-version: latest-stable
-    - name: Checkout
-      uses: actions/checkout@v6
-    - name: Build
-      run: swift build -v
-    - name: Run tests
-      run: swift test -v
+      - name: Set Xcode version
+        uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: latest-stable
+      - name: Checkout
+        uses: actions/checkout@v6
+      - name: Build
+        run: swift build -v
+      - name: Run tests
+        run: swift test -v