[develop] Update ufs-weather-model hash and further clean the machines tested in PULL_REQUEST_TEMPLATE

DESCRIPTION OF CHANGES:

Update ufs-weather-model hash to 485ccdf (June 5)
Add hera.gnu, remove cheyenne.intel, cheyenne.gnu, and gaeac5.intel, and alphabetize the machines in the TESTS CONDUCTED section of the PULL_REQUEST_TEMPLATE

[X] derecho.intel - Fundamental tests and AQM sample config (ush/config.aqm.yaml) were run
[X] gaea.intel - Fundamental and Comprehensive tests were run
[X] hera.gnu - Fundamental tests were run
[X] hera.intel - Fundamental and AQM WE2E tests were run
[X] hercules.intel - Fundamental and AQM WE2E tests were run
[X] jet.intel - Fundamental tests were run
[X] orion.intel - Fundamental and AQM sample config (ush/config.aqm.yaml) were run
[ ] wcoss2.intel
[ ] NOAA Cloud (indicate which platform)
[ ] Jenkins
[X] fundamental test suite
[X] comprehensive tests

[X] My code follows the style guidelines in the Contributor's Guide
[X] I have performed a self-review of my own code using the Code Reviewer's Guide
[ ] My changes need updates to the documentation. I have made corresponding changes to the documentation
[ ] My changes do not require updates to the documentation (explain).
[X] My changes generate no new warnings
[X] New and existing tests pass with my changes