Update NodeJS to LTS version in expiring bucket lambda function

[spencerkittleson]

Issue: The bucket expiring lambda function uses nodejs 12 runtime which was deprecated on March 31,2023. It is no longer usable.

LambdaSharpTool/src/LambdaSharp.Tool/Resources/LambdaSharpBucketExpiring.yml

Line 65 in 65394c7

Runtime: nodejs12.x

See AWS docs here for confirmation: https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html

[bjorg]

Please submit a pull-request for it. I'm not actively maintaining this project anymore.