Make PostgreSQL 14 as the default version
What does this MR do and why?
This MR restores a previously reverted MR: !127178 (merged), which was reverted due to Cannot upgrade PostgreSQL version via gdk update (gitlab-development-kit#1960 - closed). Since the issue has been resolved, we're set to make PostgreSQL version 14 as the default version.
Related to #1831 (closed)
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