chore(ci): fix imports to build Lambda layer (aws-powertools#5557)

Fix CDK version + imports

Author: leandrodamascena

Diff for: layer_v3/layer/layer_stack.py

@@ -15,8 +15,7 @@
 from aws_cdk.aws_lambda import Architecture, CfnLayerVersionPermission, Runtime
 from aws_cdk.aws_ssm import StringParameter
 from constructs import Construct
-
-from ..layer_constructors.layer_stack import LambdaPowertoolsLayerPythonV3
+from layer_constructors.layer_stack import LambdaPowertoolsLayerPythonV3
 
 
 @jsii.implements(IAspect)