chore(rds): upgrade cluster(postgresql) version (#25000)

- [Amazon Aurora supports PostgreSQL 14.7, 13.10, 12.14, and 11.19 versions](https://aws.amazon.com/about-aws/whats-new/2023/04/amazon-aurora-supports-postgresql-additional-versions/)
- [Amazon Aurora now supports PostgreSQL 15](https://aws.amazon.com/about-aws/whats-new/2023/04/amazon-aurora-postgresql-15/)
     -  > Amazon Aurora PostgreSQL-Compatible Edition now supports PostgreSQL major version 15 (15.2). 

----

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

packages/aws-cdk-lib/aws-rds/lib/cluster-engine.ts

@@ -659,6 +659,8 @@ export class AuroraPostgresEngineVersion {
   public static readonly VER_11_17 = AuroraPostgresEngineVersion.of('11.17', '11', { s3Import: true, s3Export: true });
   /** Version "11.18". */
   public static readonly VER_11_18 = AuroraPostgresEngineVersion.of('11.18', '11', { s3Import: true, s3Export: true });
+  /** Version "11.19". */
+  public static readonly VER_11_19 = AuroraPostgresEngineVersion.of('11.19', '11', { s3Import: true, s3Export: true });
   /** Version "12.4". */
   public static readonly VER_12_4 = AuroraPostgresEngineVersion.of('12.4', '12', { s3Import: true, s3Export: true });
   /** Version "12.6". */
@@ -677,6 +679,8 @@ export class AuroraPostgresEngineVersion {
   public static readonly VER_12_12 = AuroraPostgresEngineVersion.of('12.12', '12', { s3Import: true, s3Export: true });
   /** Version "12.13". */
   public static readonly VER_12_13 = AuroraPostgresEngineVersion.of('12.13', '12', { s3Import: true, s3Export: true });
+  /** Version "12.14". */
+  public static readonly VER_12_14 = AuroraPostgresEngineVersion.of('12.14', '12', { s3Import: true, s3Export: true });
   /** Version "13.3". */
   public static readonly VER_13_3 = AuroraPostgresEngineVersion.of('13.3', '13', { s3Import: true, s3Export: true });
   /** Version "13.4". */
@@ -691,6 +695,8 @@ export class AuroraPostgresEngineVersion {
   public static readonly VER_13_8 = AuroraPostgresEngineVersion.of('13.8', '13', { s3Import: true, s3Export: true });
   /** Version "13.9". */
   public static readonly VER_13_9 = AuroraPostgresEngineVersion.of('13.9', '13', { s3Import: true, s3Export: true });
+  /** Version "13.10". */
+  public static readonly VER_13_10 = AuroraPostgresEngineVersion.of('13.10', '13', { s3Import: true, s3Export: true });
   /** Version "14.3". */
   public static readonly VER_14_3 = AuroraPostgresEngineVersion.of('14.3', '14', { s3Import: true, s3Export: true });
   /**
@@ -702,6 +708,10 @@ export class AuroraPostgresEngineVersion {
   public static readonly VER_14_5 = AuroraPostgresEngineVersion.of('14.5', '14', { s3Import: true, s3Export: true });
   /** Version "14.6". */
   public static readonly VER_14_6 = AuroraPostgresEngineVersion.of('14.6', '14', { s3Import: true, s3Export: true });
+  /** Version "14.7". */
+  public static readonly VER_14_7 = AuroraPostgresEngineVersion.of('14.7', '14', { s3Import: true, s3Export: true });
+  /** Version "15.2". */
+  public static readonly VER_15_2 = AuroraPostgresEngineVersion.of('15.2', '15', { s3Import: true, s3Export: true });
 
   /**
    * Create a new AuroraPostgresEngineVersion with an arbitrary version.