chore(rds): add Oracle engine versions released in January 2025 Update (#33411)

Add missing engine versions.

Ref: https://aws.amazon.com/about-aws/whats-new/2025/02/amazon-rds-oracle-january-2025-release-update/

```sh
% aws rds describe-db-engine-versions \
    --region us-east-1 \
    --query "DBEngineVersions[?EngineVersion=='19.0.0.0.ru-2025-01.rur-2025-01.r1' || EngineVersion=='21.0.0.0.ru-2025-01.rur-2025-01.r1'].[Engine, EngineVersion, Status]" \
    --output table

-----------------------------------------------------------------------
|                      DescribeDBEngineVersions                       |
+-----------------+--------------------------------------+------------+
|  oracle-ee      |  19.0.0.0.ru-2025-01.rur-2025-01.r1  |  available |
|  oracle-ee-cdb  |  19.0.0.0.ru-2025-01.rur-2025-01.r1  |  available |
|  oracle-ee-cdb  |  21.0.0.0.ru-2025-01.rur-2025-01.r1  |  available |
|  oracle-se2     |  19.0.0.0.ru-2025-01.rur-2025-01.r1  |  available |
|  oracle-se2-cdb |  19.0.0.0.ru-2025-01.rur-2025-01.r1  |  available |
|  oracle-se2-cdb |  21.0.0.0.ru-2025-01.rur-2025-01.r1  |  available |
+-----------------+--------------------------------------+------------+
```

### 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: mazyu36

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

@@ -2214,6 +2214,8 @@ export class OracleEngineVersion {
   public static readonly VER_19_0_0_0_2024_07_R1 = OracleEngineVersion.of('19.0.0.0.ru-2024-07.rur-2024-07.r1', '19');
   /** Version "19.0.0.0.ru-2024-10.rur-2024-10.r1". */
   public static readonly VER_19_0_0_0_2024_10_R1 = OracleEngineVersion.of('19.0.0.0.ru-2024-10.rur-2024-10.r1', '19');
+  /** Version "19.0.0.0.ru-2025-01.rur-2025-01.r1". */
+  public static readonly VER_19_0_0_0_2025_01_R1 = OracleEngineVersion.of('19.0.0.0.ru-2025-01.rur-2025-01.r1', '19');
 
   /** Version "21" (only a major version, without a specific minor version). */
   public static readonly VER_21 = OracleEngineVersion.of('21', '21');
@@ -2243,6 +2245,8 @@ export class OracleEngineVersion {
   public static readonly VER_21_0_0_0_2024_07_R1 = OracleEngineVersion.of('21.0.0.0.ru-2024-07.rur-2024-07.r1', '21');
   /** Version "21.0.0.0.ru-2024-10.rur-2024-10.r1". */
   public static readonly VER_21_0_0_0_2024_10_R1 = OracleEngineVersion.of('21.0.0.0.ru-2024-10.rur-2024-10.r1', '21');
+  /** Version "21.0.0.0.ru-2025-01.rur-2025-01.r1". */
+  public static readonly VER_21_0_0_0_2025_01_R1 = OracleEngineVersion.of('21.0.0.0.ru-2025-01.rur-2025-01.r1', '21');
 
   /**
    * Creates a new OracleEngineVersion with an arbitrary version.