pgtest: update shell script to use more modern syntax

Bruce Momjian <bruce@momjian.us>

Commit: 50d1a6444ea789786ed673c9cd387548fc63cacb
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-08-14T17:45:29Z
Releases: 17.0
pgtest:  update shell script to use more modern syntax

script is src/tools/pgtest

Backpatch-through: master

Files

PathChange+/−
src/tools/pgtest modified +11 −11