Implement changes from 2025 salary negotiations

This is a scheduled issue to implement changes arising from the 2025 pay negotiations.

Please note, whoever picks this issue up should create a copy of this issue for 2025 with a due date set to 2025-09-01

Technical Notes

The actual job requires that you add the figures from the All Grades (Excel) spreadsheet (not currently, but published elsewhere as per the comment below) on the HR salary scales page to the module's salary_scales.yaml file.

Please remember to add a version tag to your commit and then raise MRs on the webapp and salaries-commitments projects to deploy the resulting changes. Link the MR's to this issue.