fix uses

Author: hamishfagg

.github/workflows/build_deploy_dev.yml

@@ -42,7 +42,6 @@ jobs:
   # and they don't depend on build or deployment
   run_unit_tests:
     name: Run Unit Tests
-    runs-on: mdb-dev
     needs: [changes]
     if: ${{ needs.changes.outputs.not-docs == 'true' }}
     uses: ./.github/workflows/tests_unit.yml

.github/workflows/build_deploy_staging.yml

@@ -21,7 +21,6 @@ jobs:
 
   run_unit_tests:
     name: Run Unit Tests
-    runs-on: mdb-dev
     if: github.event.pull_request.merged == true
     uses: ./.github/workflows/tests_unit.yml
     with: