fix: api gateway point to lambda published version

[KayakinCoder]

Related issue(s)

Proposed Changes

• Have api gateway point to the published version of the api lambda (otherwise things like provisioned concurrency do not work)
• List all deps of the gateway in a triggers block so that changes to them force a redeploy of the gateway stage

Testing

This change was validated by the following observations:

• terraform validate

Checklist

General

• I have deployed and validated this change
• Changelog
  • I have added my changes to CHANGELOG.md
  • No changelog entry is necessary

If releasing a new version

• In CHANGELOG.md, I have moved unreleased items to a newly created release section

If a new input variable was added

• I have added a new variable in inputs.tf with a description, added the variable to defaults.tfvars, and to ./utils/cicd/main.tf

If the built-in stac-server version was updated

• I have updated the stac_server_version default value in inputs.tf, noted a version bump in CHANGELOG.md, and updated the STAC_SERVER_TAG throughout ./.github/workflows