fix linter

Signed-off-by: Javier Rodriguez <javier@chainloop.dev>

Author: javirln

internal/attestation/crafter/materials/artifact_test.go

@@ -13,6 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//nolint:dupl
 package materials_test
 
 import (