lambda-sns-terraform: Update runtime to nodejs22.x

[kakakakakku]

Issue #, if available:
N/A

Description of changes:
Hi😀 Thanks for the useful patterns!

To prevent future deployment issues, I updated the Lambda Node.js runtime version to nodejs22.x.

While testing lambda-sns-terraform, I noticed that the Lambda runtime version nodejs16.x was deprecated. Although it's still deployable at the moment, it will not be allowed after October 1, 2025.
https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html

Check

terraform apply completed successfully and works good.

$ aws lambda invoke --function-name TopicPublisherFunction response.json
{
    "StatusCode": 200,
    "ExecutedVersion": "$LATEST"
}

Thank you😀

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[ellisms]

Thanks for the updates @kakakakakku . I'll add this to the publishing queue.