docs(aws-cdk-lib): update README to reference DependencyGroup instead… (

aws#19520)

… of ConcreteDependable

Closes aws#19352 

----


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

packages/@aws-cdk/core/README.md

@@ -345,13 +345,13 @@ relationship between all resources in the scope of `constructA` and all
 resources in the scope of `constructB`.
 
 If you want a single object to represent a set of constructs that are not
-necessarily in the same scope, you can use a `ConcreteDependable`. The
+necessarily in the same scope, you can use a `DependencyGroup`. The
 following creates a single object that represents a dependency on two
 constructs, `constructB` and `constructC`:
 
 ```ts
 // Declare the dependable object
-const bAndC = new ConcreteDependable();
+const bAndC = new DependencyGroup();
 bAndC.add(constructB);
 bAndC.add(constructC);
 

packages/@aws-cdk/core/rosetta/default.ts-fixture

@@ -18,8 +18,6 @@ import {
   CfnParameter,
   CfnResource,
   CfnResourceProps,
-  ConcreteDependable,
-  Construct,
   CustomResource,
   CustomResourceProvider,
   CustomResourceProviderRuntime,
@@ -36,6 +34,10 @@ import {
   Stage,
   Token,
 } from '@aws-cdk/core';
+import {
+  Construct,
+  DependencyGroup, 
+} from 'constructs';
 
 declare const app: App;
 declare const arn: 'arn:partition:service:region:account-id:resource-id';

packages/aws-cdk-lib/README.md

@@ -376,13 +376,13 @@ relationship between all resources in the scope of `constructA` and all
 resources in the scope of `constructB`.
 
 If you want a single object to represent a set of constructs that are not
-necessarily in the same scope, you can use a `ConcreteDependable`. The
+necessarily in the same scope, you can use a `DependencyGroup`. The
 following creates a single object that represents a dependency on two
 constructs, `constructB` and `constructC`:
 
 ```ts
 // Declare the dependable object
-const bAndC = new ConcreteDependable();
+const bAndC = new DependencyGroup();
 bAndC.add(constructB);
 bAndC.add(constructC);