Bump CI to Swift 6 toolchain

Author: donnywals

.github/workflows/transloaditkit-ci.yml

@@ -6,7 +6,7 @@ jobs:
     strategy:
       matrix:
         os: ["macos-latest"]
-        swift: ["5.10"]
+        swift: ["6.0.2"]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Extract Branch Name