Fix Action config indentation.

.github/workflows/ci.yml

@@ -40,7 +40,7 @@ jobs:
   watchOS:
     name: Build watchOS
     runs-on: macOS-latest
-        strategy:
+    strategy:
       matrix:
         destination: ["OS=5.3,name=Apple Watch Series 4 - 44mm", "OS=4.2,name=Apple Watch Series 3 - 42mm", "OS=3.2,name=Apple Watch Series 2 - 42mm"]
     steps: