fix(database): exclude limitless suffix from Aurora PostgreSQL versions

[CuriousLearner]

This update excludes any Aurora PostgreSQL version with the limitless suffix from selection. Currently, the available versions are:

11.9    11.21   12.9    12.11   12.12   12.13   12.14   12.15   12.16   12.17   12.18       12.19   12.20   13.7    13.8    13.9    13.10   13.11   13.12   13.12   13.13       13.14   13.15   13.16   14.3    14.4    14.5    14.6    14.7    14.8    14.9        14.10   14.11   14.12   14.13   15.2    15.3    15.4    15.5    15.6    15.7        15.8    16.1    16.2    16.3    16.4    16.4-limitless

While 16.4-limitless is the latest version, it is only compatible with memory-optimized instance types and does not work with general-purpose instances like db.t4g.medium. This change ensures that a compatible version, such as 16.4, is selected instead of the limitless version by default.

Latest run here: https://github.com/apppackio/apppack/actions/runs/11672003987