fix(detect-secrets): add case for non utf-8 values

tests/providers/aws/services/awslambda/awslambda_function_no_secrets_in_variables/awslambda_function_no_secrets_in_variables_test.py

@@ -121,6 +121,51 @@ class Test_awslambda_function_no_secrets_in_variables:
             )
             assert result[0].resource_tags == []
 
+    def test_function_secrets_in_variables_unknown(self):
+        lambda_client = mock.MagicMock
+        function_name = "test-lambda"
+        function_runtime = "nodejs4.3"
+        function_arn = f"arn:aws:lambda:{AWS_REGION_US_EAST_1}:{AWS_ACCOUNT_NUMBER}:function/{function_name}"
+
+        lambda_client.audit_config = {"secrets_ignore_patterns": []}
+
+        lambda_client.functions = {
+            "function_name": Function(
+                name=function_name,
+                security_groups=[],
+                arn=function_arn,
+                region=AWS_REGION_US_EAST_1,
+                runtime=function_runtime,
+                environment={"db_password": "password¿€œ"},
+            )
+        }
+
+        with mock.patch(
+            "prowler.providers.common.provider.Provider.get_global_provider",
+            return_value=set_mocked_aws_provider(),
+        ), mock.patch(
+            "prowler.providers.aws.services.awslambda.awslambda_function_no_secrets_in_variables.awslambda_function_no_secrets_in_variables.awslambda_client",
+            new=lambda_client,
+        ):
+            # Test Check
+            from prowler.providers.aws.services.awslambda.awslambda_function_no_secrets_in_variables.awslambda_function_no_secrets_in_variables import (
+                awslambda_function_no_secrets_in_variables,
+            )
+
+            check = awslambda_function_no_secrets_in_variables()
+            result = check.execute()
+
+            assert len(result) == 1
+            assert result[0].region == AWS_REGION_US_EAST_1
+            assert result[0].resource_id == function_name
+            assert result[0].resource_arn == function_arn
+            assert result[0].status == "FAIL"
+            assert (
+                result[0].status_extended
+                == f"Potential secret found in Lambda function {function_name} variables -> Secret Keyword in variable UNKNOWN."
+            )
+            assert result[0].resource_tags == []
+
     def test_function_secrets_in_variables_telegram_token(self):
         lambda_client = mock.MagicMock
         function_name = "test-lambda"