chore(codepipeline-actions): change cdk.Construct to Construct (#…

…19002)

This fixes a v2 merge issue. A reference to `cdk.Construct` was added, which should have been just `Construct`.

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/@aws-cdk/aws-codepipeline-actions/lib/cloudformation/private/singleton-policy.ts

@@ -32,7 +32,7 @@ export class SingletonPolicy extends Construct implements iam.IGrantable {
   private statements: { [key: string]: iam.PolicyStatement } = {};
 
   private constructor(private readonly role: iam.IRole) {
-    super(role as unknown as cdk.Construct, SingletonPolicy.UUID);
+    super(role as unknown as Construct, SingletonPolicy.UUID);
     this.grantPrincipal = role;
   }