ci: report swiftformat violations as GitHub annotations

Drop the version pin per review. --lint is required for the reporter to emit
anything; in write mode swiftformat rewrites files and prints no annotations.

Author: renal128

.github/workflows/format.yml

@@ -15,4 +15,4 @@ jobs:
         run: brew install swiftformat
 
       - name: Run SwiftFormat in Strict Mode
-        run: swiftformat . --strict
+        run: swiftformat . --lint --strict --reporter github-actions-log