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

[MichaelLueken]

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

Type of change

• New feature (non-breaking change which adds functionality)

TESTS CONDUCTED:

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

CHECKLIST

• My code follows the style guidelines in the Contributor's Guide
• 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).
• My changes generate no new warnings
• New and existing tests pass with my changes