build(deps): bump actions/setup-go from 5 to 6

Bumps [actions/setup-go](https://github.com/actions/setup-go) from 5 to 6.
- [Release notes](https://github.com/actions/setup-go/releases)
- [Commits](https://github.com/actions/setup-go/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/setup-go
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/build.yml

@@ -43,7 +43,7 @@ jobs:
           cache: "npm"
           cache-dependency-path: "**/package-lock.json"
       - name: Set up Golang
-        uses: actions/setup-go@v6.0.0
+        uses: actions/setup-go@v6
         with:
           go-version: "^1.25.1"
       - name: Build frontend

.github/workflows/golangci-lint.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v5
       - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: oldstable
       - name: Create empty resource directory

.github/workflows/smoketest.yml

@@ -104,7 +104,7 @@ jobs:
           EOF
           ssh jkci "cat /tmp/device-tests.json" > device-tests.json
       - name: Set up Golang
-        uses: actions/setup-go@v5.5.0
+        uses: actions/setup-go@v6
         with:
           go-version: "1.24.4"
       - name: Golang Test Report