ci: bump actions/setup-go from 5 to 6 (#5330)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/cross-compile.yml

@@ -10,7 +10,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
           go-version: ${{ matrix.go }}
       - name: Get Date

.github/workflows/integration.yml

@@ -33,7 +33,7 @@ jobs:
     name: "Integration (${{ matrix.os }}, Go ${{ matrix.go }}${{ matrix.race && ', race' || '' }}${{ matrix.use32bit && ', 32-bit' || '' }})"
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
           go-version: ${{ matrix.go }}
       - name: Install go-junit-report

.github/workflows/lint.yml

@@ -8,7 +8,7 @@ jobs:
       GOEXPERIMENT: ${{ matrix.go == '1.24.x' && 'synctest' || '' }}
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
           go-version: "1.25.x"
       - name: Check for //go:build ignore in .go files
@@ -41,7 +41,7 @@ jobs:
     name: golangci-lint (Go ${{ matrix.go }})
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
           go-version: ${{ matrix.go }}
       - name: golangci-lint (Linux)

.github/workflows/unit.yml

@@ -15,7 +15,7 @@ jobs:
       GOEXPERIMENT: ${{ matrix.go == '1.24.x' && 'synctest' || '' }}
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
           go-version: ${{ matrix.go }}
       - run: go version