docs: specify that the default Aurora engine version is used in integration tests instead of the LTS version

[aaron-congo]

Summary

• our current documentation and codebase suggest that we are running integration tests against the Aurora LTS engine versions, however we are actually running against the default engine versions. The changes in this PR were made because we are running the tests against Aurora Postgres 15.4, which is not listed as an LTS version in Aurora's documentation here

Description

• as far as I can tell, there is no way to programmatically fetch the list of LTS versions. As far as I can tell, the only way to determine which versions are LTS is by referencing the Aurora documentation here
• note that is possible that the default version is also an LTS version but is not included in the Aurora documentation simply because it is outdated

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[github-actions[bot]]

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