feat(neptune-alpha): engineVersion v1.3 (#28647)

This PR implements support for the [v1.3 engine](https://docs.aws.amazon.com/neptune/latest/userguide/engine-releases-1.3.0.0.html).

Closes #28648.

----

*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-neptune-alpha/README.md

@@ -100,7 +100,7 @@ const cluster = new neptune.DatabaseCluster(this, 'Database', {
 });
 ```
 
-Note: if you want to use Neptune engine `1.2.0.0` or later, you need to specify the corresponding `engineVersion` prop to `neptune.DatabaseCluster` and `family` prop of `ParameterGroupFamily.NEPTUNE_1_2` to `neptune.ClusterParameterGroup` and `neptune.ParameterGroup`.
+Note: To use the Neptune engine versions `1.2.0.0` or later, including the newly added `1.3` series, it's necessary to specify the appropriate `engineVersion` prop in `neptune.DatabaseCluster`. Additionally, for both 1.2 and 1.3 series, the corresponding `family` prop must be set to `ParameterGroupFamily.NEPTUNE_1_2` or `ParameterGroupFamily.NEPTUNE_1_3` respectively in `neptune.ClusterParameterGroup` and `neptune.ParameterGroup`.
 
 ## Adding replicas
 

packages/@aws-cdk/aws-neptune-alpha/lib/cluster.ts

@@ -76,6 +76,10 @@ export class EngineVersion {
    * Neptune engine version 1.2.1.0
    */
   public static readonly V1_2_1_0 = new EngineVersion('1.2.1.0');
+  /**
+   * Neptune engine version 1.3.0.0
+   */
+  public static readonly V1_3_0_0 = new EngineVersion('1.3.0.0');
 
   /**
    * Constructor for specifying a custom engine version

packages/@aws-cdk/aws-neptune-alpha/lib/parameter-group.ts

@@ -15,6 +15,10 @@ export class ParameterGroupFamily {
    * Family used by Neptune engine versions 1.2.0.0 and later
    */
   public static readonly NEPTUNE_1_2 = new ParameterGroupFamily('neptune1.2');
+  /**
+   * Family used by Neptune engine versions 1.3.0.0 and later
+   */
+  public static readonly NEPTUNE_1_3 = new ParameterGroupFamily('neptune1.3');
 
   /**
    * Constructor for specifying a custom parameter group famil

packages/@aws-cdk/aws-neptune-alpha/test/cluster.test.ts

@@ -121,7 +121,7 @@ describe('DatabaseCluster', () => {
   });
 
   test.each([
-    ['1.1.1.0', EngineVersion.V1_1_1_0], ['1.2.0.0', EngineVersion.V1_2_0_0],
+    ['1.1.1.0', EngineVersion.V1_1_1_0], ['1.2.0.0', EngineVersion.V1_2_0_0], ['1.3.0.0', EngineVersion.V1_3_0_0],
   ])('can create a cluster for engine version %s', (expected, version) => {
     // GIVEN
     const stack = testStack();