Update Node.js runtime to 22.x

[mikey-]

Issue #, if available: 216 (#216)

Description of changes:

A few changes here, all related to updating the default Node.js runtime from 18.x to 22.x

1. The default Node.js runtime was updated by first updating CDK to 2.168.0, which I believe is the earliest version in which lambda.Runtime.NODEJS_22_X exists; and then updating the value of LAMBDA_RUNTIME_NODE, from lambda.Runtime.NODEJS_18_X to lambda.Runtime.NODEJS_22_X.
2. To keep the CDK version consistent across this codebase, I updated it across all packages.
3. Updated deployment templates CompatibleRuntimes to nodejs22.x
4. Updated the @types/node to ^22.15.0, to match the Node.js LTS version
5. Updated tests to ensure runtime version is nodejs22.x
6. re-generated package-lock.json files for each package

I have run deployment/run-unit-tests.sh and ensured all tests are passing

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[abewub]

Thanks for the contribution, the changes are now merged in the PR

[mikey-]

You're very welcome, thanks for providing this great tool :)