fix: try Swift 6.1.1 for LLVM v9 compatibility

Even Swift 6.2 stable (September 2024) has LLVM v10 tools,
causing version mismatch with Android SDK's LLVM v9 profraw format.

Trying Swift 6.1.1 (May 2024) which may still have LLVM v9.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

Author: leogdion

.github/workflows/MistKit.yml

@@ -163,7 +163,7 @@ jobs:
       - name: Build and Test on Android
         uses: ./.github/actions/swift-android-action
         with:
-          swift-version: "6.2"  # Use stable 6.2 release for LLVM v9 compatibility
+          swift-version: "6.1.1"  # Use older Swift 6.1.1 for LLVM v9 compatibility
           android-api-level: 34
           build-package: true
           build-tests: true