chore(rds): deprecate unsupported engine version 3.03 for aurora mysql (#31386)

### Reason for this change



Aurora MySQL version 3.03 (3.03.0 - 3.03.3) is deprecated now.

https://docs.aws.amazon.com/AmazonRDS/latest/AuroraMySQLReleaseNotes/AuroraMySQL.Updates.30Updates.html

### Description of changes



Deprecated the versions and no longer use the versions in integ tests.

### Description of how you validated changes



### 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: go-to-k

packages/@aws-cdk-testing/framework-integ/test/aws-rds/test/integ.cluster-instance-ca-certificate.js.snapshot/cdk-rds-cluster-instance-ca-certificate-integ.assets.json

@@ -430,7 +430,7 @@
      "Ref": "DatabaseSubnets56F17B9A"
     },
     "Engine": "aurora-mysql",
-    "EngineVersion": "8.0.mysql_aurora.3.03.0",
+    "EngineVersion": "8.0.mysql_aurora.3.07.1",
     "MasterUserPassword": "7959866cacc02c2d243ecfe177464fe6",
     "MasterUsername": "admin",
     "VpcSecurityGroupIds": [
@@ -448,7 +448,7 @@
   "DatabaseInstance1844F58FD": {
    "Type": "AWS::RDS::DBInstance",
    "Properties": {
-    "CACertificateIdentifier": "rds-ca-2019",
+    "CACertificateIdentifier": "rds-ca-rsa4096-g1",
     "DBClusterIdentifier": {
      "Ref": "DatabaseB269D8BB"
     },
@@ -471,7 +471,7 @@
   "DatabaseInstance2AA380DEE": {
    "Type": "AWS::RDS::DBInstance",
    "Properties": {
-    "CACertificateIdentifier": "rds-ca-2019",
+    "CACertificateIdentifier": "rds-ca-rsa4096-g1",
     "DBClusterIdentifier": {
      "Ref": "DatabaseB269D8BB"
     },