[Chapel Merge] Drop valgrindexe nodepara to 6

Branch: refs/heads/master
Revision: df39e93
Author: e-kayrakli
Log Message:

Merge pull request #16367 from e-kayrakli/drop-valgrind-nodepara

Drop valgrindexe nodepara to 6

valgrindexe testing is taking 2-3 hours. This PR drops its nodepara from 20 to
6.

[Reviewed by @ronawho]

Modified Files:
M util/cron/test-valgrindexe.bash

Compare: https://github.com/chapel-lang/chapel/compare/3d2f35fbb964...df39e933ecd7