Update actions/setup-go action to v6

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/go.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Check-out code
       uses: actions/checkout@v5
     - name: Set up Go using version from go.mod
-      uses: actions/setup-go@v5
+      uses: actions/setup-go@v6
       with:
         go-version-file: 'go.mod'
     - name: Run unit tests
@@ -29,7 +29,7 @@ jobs:
     - name: Check-out code
       uses: actions/checkout@v5
     - name: Set up Go using version from go.mod
-      uses: actions/setup-go@v5
+      uses: actions/setup-go@v6
       with:
         go-version-file: 'go.mod'
     - name: Check tidiness
@@ -42,7 +42,7 @@ jobs:
     - name: Check-out code
       uses: actions/checkout@v5
     - name: Set up Go using version from go.mod
-      uses: actions/setup-go@v5
+      uses: actions/setup-go@v6
       with:
         go-version-file: 'go.mod'
     - name: Run code linters