This upgrades the gem to support the new `ruby3.2` runtime
of which AWS says:

"Ruby 3.2 adds many features and performance improvements, including anonymous
arguments passing improvements, ‘endless’ methods, Regexp improvements, a new
Data class, support for pattern-matching in Time and MatchData, and support for
‘find pattern’ in pattern matching.

Existing Lambda customers using the Ruby 2.7 runtime should migrate to the Ruby
3.2 runtime as soon as possible. Even though community support for Ruby 2.7 has
ended, Lambda has extended support for the Ruby 2.7 runtime until December 7,
2023 to provide existing Ruby customers with time to transition to Ruby 3.2.
Functions using Ruby 2.7 continue to be eligible for technical support and
Lambda will continue to apply OS security updates to the runtime until this
date."

This also changes the docker image used to build the package dependencies from
the `lambci/lambda:*` images to the `amazon/aws-lambda-ruby:*` images provided
and maintained by AWS.  These images are the exact images used by lambda
functions using a ruby runtime.  They unfortunately don't have all the build
dependencies present in the lambci images.  Thus a wrapper script is provided
around the gem packaging in a docker container that ensures the necessary
packages are installed

- Rebase to get latest changes; regen yarn.lock file
- Remove commented out code in integration.sh (done in rebase)
- Remove documented ability to override the docker image

So that its installed with the plugin into node-modules and can
be invoked from a serverless project when bundling w/native
extensions.