chore: Update grafana/k6 Docker tag to v1.4.2

| datasource | package    | from  | to    |
| ---------- | ---------- | ----- | ----- |
| docker     | grafana/k6 | 1.4.0 | 1.4.2 |


Signed-off-by: renovate-sh-app[bot] <219655108+renovate-sh-app[bot]@users.noreply.github.com>

Author: renovate-sh-app[bot]

integration/integration_test.go

@@ -74,7 +74,7 @@ func TestIntegration(t *testing.T) {
 		Started: true,
 		ContainerRequest: testcontainers.ContainerRequest{
 			// Renovate updates the version below. Keep its format as it is or update the renovate config with it.
-			Image:      "grafana/k6:1.4.0",
+			Image:      "grafana/k6:1.4.2",
 			Entrypoint: []string{"/bin/sleep", "infinity"},
 			Networks:   []string{network.Name},
 		},