fix: Typo, Update RDS Engine Version, and Enable Encryption by Default

[KennyDizi]

Type

Bug fix, Enhancement

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Description

• Corrected a typo in the variable name (rdsClusterarn to rdsClusterArn) to improve code readability and consistency.
• Updated the Aurora MySQL engine version to VER_2_07_9 to use a more recent, non-deprecated version.
• Enabled storageEncrypted by default for new RDS clusters to enhance security.

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Changes walkthrough

	Relevant files
Enhancement	index.ts Fix Typo, Update Default Engine Version, and Enable Encryption by Default src/index.ts Corrected variable name from rdsClusterarn to rdsClusterArn to fix a typo. Updated the default Aurora MySQL engine version to VER_2_07_9. Ensured storageEncrypted is enabled by default for the RDS cluster.

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[KennyDizi]

@neilkuan Could you take a look at this PR?

[neilkuan]

Hi @KennyDizi
Please run yarn build at local.
And commit API.md file. Thanks