chore(deps): update actions/setup-go action to v6

Author: renovate[bot]

.github/workflows/check-diff.yaml

@@ -12,7 +12,7 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v4
     - name: Setup Go
-      uses: actions/setup-go@v5
+      uses: actions/setup-go@v6
       with:
         go-version-file: '${{ github.workspace }}/go.mod'
     - name: Make swag

.github/workflows/ci.yaml

@@ -19,7 +19,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         id: setup-go
         with:
           go-version-file: "go.mod"
@@ -56,7 +56,7 @@ jobs:
         run: git fetch --prune --unshallow
 
       - name: Setup Go
-        uses: actions/setup-go@v5 # v5.0.2
+        uses: actions/setup-go@v6
         id: setup-go
         with:
           go-version-file: "go.mod"