chore(deps): Update actions/checkout action to v6

.github/workflows/gen-client.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           token: ${{ secrets.GH_CQ_BOT }}
 

.github/workflows/lint_golang.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-go@v5
         with:
           go-version-file: go.mod

.github/workflows/unittest.yml

@@ -17,7 +17,7 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
     steps:
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Set up Go 1.x
         uses: actions/setup-go@v5
         with: