feat(neptune-alpha): add engine versions up to v1.4.5.0 (#33989)

### Issue # (if applicable)

Closes #33807

### Reason for this change

Neptune engine versions not up-to-date.

### Description of changes

Added engine up to most recently released version as specified here https://docs.aws.amazon.com/neptune/latest/userguide/engine-releases.html

### Describe any new or updated permissions being added

N/A


### Description of how you validated changes

Integration test

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

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

Author: iridescent99

Diff for: packages/@aws-cdk/aws-neptune-alpha/README.md

@@ -100,7 +100,7 @@ const cluster = new neptune.DatabaseCluster(this, 'Database', {
 });
 ```
 
-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`.
+Note: To use the Neptune engine versions `1.2.0.0` or later, including the newly added `1.4` series, it's necessary to specify the appropriate `engineVersion` prop in `neptune.DatabaseCluster`. Additionally, for both 1.2,  1.3 and 1.4 series, the corresponding `family` prop must be set to `ParameterGroupFamily.NEPTUNE_1_2`, `ParameterGroupFamily.NEPTUNE_1_3` or `ParameterGroupFamily.NEPTUNE_1_4` respectively in `neptune.ClusterParameterGroup` and `neptune.ParameterGroup`.
 
 ## Adding replicas
 

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

@@ -109,6 +109,30 @@ export class EngineVersion {
    * Neptune engine version 1.3.4.0
    */
   public static readonly V1_3_4_0 = new EngineVersion('1.3.4.0');
+  /**
+   * Neptune engine version 1.4.0.0
+   */
+  public static readonly V1_4_0_0 = new EngineVersion('1.4.0.0');
+  /**
+   * Neptune engine version 1.4.1.0
+   */
+  public static readonly V1_4_1_0 = new EngineVersion('1.4.1.0');
+  /**
+   * Neptune engine version 1.4.2.0
+   */
+  public static readonly V1_4_2_0 = new EngineVersion('1.4.2.0');
+  /**
+   * Neptune engine version 1.4.3.0
+   */
+  public static readonly V1_4_3_0 = new EngineVersion('1.4.3.0');
+  /**
+   * Neptune engine version 1.4.4.0
+   */
+  public static readonly V1_4_4_0 = new EngineVersion('1.4.4.0');
+  /**
+   * Neptune engine version 1.4.5.0
+   */
+  public static readonly V1_4_5_0 = new EngineVersion('1.4.5.0');
 
   /**
    * Constructor for specifying a custom engine version

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

@@ -19,6 +19,10 @@ export class ParameterGroupFamily {
    * Family used by Neptune engine versions 1.3.0.0 and later
    */
   public static readonly NEPTUNE_1_3 = new ParameterGroupFamily('neptune1.3');
+  /**
+   * Family used by Neptune engine versions 1.4.0.0 and later
+   */
+  public static readonly NEPTUNE_1_4 = new ParameterGroupFamily('neptune1.4');
 
   /**
    * Constructor for specifying a custom parameter group family

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

@@ -121,6 +121,7 @@ describe('DatabaseCluster', () => {
 
   test.each([
     ['1.1.1.0', EngineVersion.V1_1_1_0], ['1.2.0.0', EngineVersion.V1_2_0_0], ['1.3.0.0', EngineVersion.V1_3_0_0],
+    ['1.4.0.0', EngineVersion.V1_4_0_0],
   ])('can create a cluster for engine version %s', (expected, version) => {
     // GIVEN
     const stack = testStack();