CI: Cancel outdated workflow runs instead of newer ones

Change concurrent_skipping from 'same_content_newer' to 'outdated_runs'.
Previously, when pushing multiple commits in quick succession, the newer
workflow run would be skipped while the older one continued. This is
backwards for development, i.e., we want to test the latest code and
cancel the outdated runs.

Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>

Author: ixhamza

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
         id: skip_check
         uses: fkirc/skip-duplicate-actions@v5
         with:
-          concurrent_skipping: 'same_content_newer'
+          concurrent_skipping: 'outdated_runs'
 
   build_debug_kernel: