feat(rds): add Aurora MySQL versions 2.11.6, 2.12.5, 3.04.4 (#34443)

### Reason for this change

New Aurora MySQL versions are available.
- 2.11.6 / 2.12.5 - [Database engine updates for Amazon Aurora MySQL version 2](https://docs.aws.amazon.com/AmazonRDS/latest/AuroraMySQLReleaseNotes/AuroraMySQL.Updates.20Updates.html)
- 3.04.4 - [Database engine updates for Amazon Aurora MySQL version 3](https://docs.aws.amazon.com/AmazonRDS/latest/AuroraMySQLReleaseNotes/AuroraMySQL.Updates.30Updates.html)

### Description of changes

Added above Aurora MySQL versions.

### Describe any new or updated permissions being added

N/A

### Description of how you validated changes

```console
$ aws --region us-east-1 rds describe-db-engine-versions --engine aurora-mysql --query 'DBEngineVersions[].EngineVersion'
[
    "5.7.mysql_aurora.2.11.1",
    "5.7.mysql_aurora.2.11.2",
    "5.7.mysql_aurora.2.11.3",
    "5.7.mysql_aurora.2.11.4",
    "5.7.mysql_aurora.2.11.5",
    "5.7.mysql_aurora.2.11.6",
    "5.7.mysql_aurora.2.12.0",
    "5.7.mysql_aurora.2.12.1",
    "5.7.mysql_aurora.2.12.2",
    "5.7.mysql_aurora.2.12.3",
    "5.7.mysql_aurora.2.12.4",
    "5.7.mysql_aurora.2.12.5",
    "8.0.mysql_aurora.3.04.0",
    "8.0.mysql_aurora.3.04.1",
    "8.0.mysql_aurora.3.04.2",
    "8.0.mysql_aurora.3.04.3",
    "8.0.mysql_aurora.3.04.4",
    "8.0.mysql_aurora.3.05.2",
    "8.0.mysql_aurora.3.06.0",
    "8.0.mysql_aurora.3.06.1",
    "8.0.mysql_aurora.3.07.0",
    "8.0.mysql_aurora.3.07.1",
    "8.0.mysql_aurora.3.08.0",
    "8.0.mysql_aurora.3.08.1",
    "8.0.mysql_aurora.3.08.2"
]
```

### 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: Tietew

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

@@ -553,6 +553,8 @@ export class AuroraMysqlEngineVersion {
   public static readonly VER_2_11_4 = AuroraMysqlEngineVersion.builtIn_5_7('2.11.4');
   /** Version "5.7.mysql_aurora.2.11.5". */
   public static readonly VER_2_11_5 = AuroraMysqlEngineVersion.builtIn_5_7('2.11.5');
+  /** Version "5.7.mysql_aurora.2.11.6". */
+  public static readonly VER_2_11_6 = AuroraMysqlEngineVersion.builtIn_5_7('2.11.6');
   /** Version "5.7.mysql_aurora.2.12.0". */
   public static readonly VER_2_12_0 = AuroraMysqlEngineVersion.builtIn_5_7('2.12.0');
   /** Version "5.7.mysql_aurora.2.12.1". */
@@ -563,6 +565,8 @@ export class AuroraMysqlEngineVersion {
   public static readonly VER_2_12_3 = AuroraMysqlEngineVersion.builtIn_5_7('2.12.3');
   /** Version "5.7.mysql_aurora.2.12.4". */
   public static readonly VER_2_12_4 = AuroraMysqlEngineVersion.builtIn_5_7('2.12.4');
+  /** Version "5.7.mysql_aurora.2.12.5". */
+  public static readonly VER_2_12_5 = AuroraMysqlEngineVersion.builtIn_5_7('2.12.5');
   /**
    * Version "8.0.mysql_aurora.3.01.0"
    * @deprecated Aurora MySQL 8.0.mysql_aurora.3.01.0 is no longer supported by Amazon RDS.
@@ -621,6 +625,8 @@ export class AuroraMysqlEngineVersion {
   public static readonly VER_3_04_2 = AuroraMysqlEngineVersion.builtIn_8_0('3.04.2');
   /** Version "8.0.mysql_aurora.3.04.3". */
   public static readonly VER_3_04_3 = AuroraMysqlEngineVersion.builtIn_8_0('3.04.3');
+  /** Version "8.0.mysql_aurora.3.04.4". */
+  public static readonly VER_3_04_4 = AuroraMysqlEngineVersion.builtIn_8_0('3.04.4');
   /**
    * Version "8.0.mysql_aurora.3.05.0"
    * @deprecated Aurora MySQL 8.0.mysql_aurora.3.05.0 is no longer supported by Amazon RDS.

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

@@ -153,6 +153,9 @@ describe('cluster engine', () => {
     const engine_ver_2_12_4 = DatabaseClusterEngine.auroraMysql({
       version: AuroraMysqlEngineVersion.VER_2_12_4,
     });
+    const engine_ver_2_12_5 = DatabaseClusterEngine.auroraMysql({
+      version: AuroraMysqlEngineVersion.VER_2_12_5,
+    });
 
     // THEN
     expect(engine_ver_2_7_3.parameterGroupFamily).toEqual('aurora-mysql5.7');
@@ -166,6 +169,7 @@ describe('cluster engine', () => {
     expect(engine_ver_2_11_3.parameterGroupFamily).toEqual('aurora-mysql5.7');
     expect(engine_ver_2_12_3.parameterGroupFamily).toEqual('aurora-mysql5.7');
     expect(engine_ver_2_12_4.parameterGroupFamily).toEqual('aurora-mysql5.7');
+    expect(engine_ver_2_12_5.parameterGroupFamily).toEqual('aurora-mysql5.7');
   });
 
   test('cluster parameter group correctly determined for AURORA_MYSQL 3.x and given version', () => {