force the crucible-release workflow to generate tags using UTC timezo…

…ne instead of whatever is set on the runner

- The workflow is scheduled to run based on UTC so the resulting tag
  is expected to match that.  In other words, if it runs at midnight
  on 2024-10-01 UTC but the local clock is in US CDT we want the date
  command to return month=10 and day=01 instead of month=09 and day=30
  since the local clock is hours behind UTC.

.github/workflows/crucible-release.yaml

@@ -71,8 +71,8 @@ jobs:
         id: gen-release-tag
         run: |
             if [ "${{ inputs.custom_tag }}" == "" ]; then
-                year="$(date +%Y)"
-                month="$(date +%m)"
+                year="$(date -u +%Y)"
+                month="$(date -u +%m)"
                 month=${month#0}
                 quarter="$(((month-1)/3+1))"
                 echo "tag=$year.$quarter" >> $GITHUB_OUTPUT