[Chapel Merge] Load Horizon nightly test deps from new Spack install

Branch: refs/heads/main
Revision: 3f05542ba55e48f6d188d073d6989b0abc64a79d
Author: riftEmber
Link: Load Horizon nightly test deps from new Spack install by riftEmber · Pull Request #24914 · chapel-lang/chapel · GitHub
Log Message:
Load Horizon nightly test deps from new Spack install (#24914)

As part of https://github.com/Cray/chapel-private/issues/6164.

[unlikely to break in a way review would catch, not reviewed]

Compare: Comparing af0a260238b2310fb3709011e79929d5563652c3...eea7623db54e5c17255e2ccfa17e1e82ff016d1c · chapel-lang/chapel · GitHub

Diff:
M util/cron/load-base-deps.bash
https://github.com/chapel-lang/chapel/pull/24914.diff