Merge pull request #19 from FunctionCalling/renovate/actions-checkout-6.x

Update actions/checkout action to v6

Author: fumito-ito

.github/workflows/swift.yml

@@ -12,7 +12,7 @@ jobs:
   build:
     runs-on: macos-15
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Install swiftlint
       run: |
         brew update