CI: Fix workflow syntax error

Author: priteau

.github/workflows/upstream-sync.yml

@@ -20,7 +20,7 @@ jobs:
     uses: stackhpc/.github/.github/workflows/upstream-sync.yml@main
     with:
       release_series: 2024.1
-  synchronise-2025.1:
+  synchronise-2025-1:
     if: github.repository == 'stackhpc/stackhpc-kayobe-config'
     name: Synchronise 2025.1
     uses: stackhpc/.github/.github/workflows/upstream-sync.yml@main