chore(rds): deprecate unsupported aurora mysql versions (aws#30282)

### Reason for this change

The following Aurora MySQL versions are no longer supported by RDS:
- 5.7.mysql_aurora.2.07.9
- 5.7.mysql_aurora.2.07.10
- 8.0.mysql_aurora.3.01.0
- 8.0.mysql_aurora.3.01.1
- 8.0.mysql_aurora.3.02.0
- 8.0.mysql_aurora.3.02.1
- 8.0.mysql_aurora.3.02.2
- 8.0.mysql_aurora.3.02.3

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

### Description of changes

Marked the unsupported Aurora MySQL versions as deprecated and fixed failing integ tests. I have also confirmed that these versions are not configurable via the RDS console.

### 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*

packages/@aws-cdk-testing/framework-integ/test/aws-rds/test/integ.cluster-instance-id.js.snapshot/Default.template.json

@@ -489,7 +489,7 @@
      "S3Bucket": {
       "Fn::Sub": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}"
      },
-     "S3Key": "18d379b052acd60e0d086d5b19d9bef956ebc0bd018c5570960125aab0c7f837.zip"
+     "S3Key": "bde7b5c89cb43285f884c94f0b9e17cdb0f5eb5345005114dd60342e0b8a85a1.zip"
     },
     "Timeout": 900,
     "MemorySize": 128,
@@ -582,7 +582,7 @@
      "Ref": "DatabaseSubnets56F17B9A"
     },
     "Engine": "aurora-mysql",
-    "EngineVersion": "8.0.mysql_aurora.3.01.0",
+    "EngineVersion": "8.0.mysql_aurora.3.06.0",
     "MasterUserPassword": {
      "Fn::Join": [
       "",
@@ -625,7 +625,7 @@
     "DBClusterIdentifier": {
      "Ref": "DatabaseB269D8BB"
     },
-    "DBInstanceClass": "db.t3.small",
+    "DBInstanceClass": "db.t3.medium",
     "Engine": "aurora-mysql",
     "PromotionTier": 0
    },