fix(action): reduce parallel jobs from 16 to 8 for repo sync in action.yml

.github/actions/download-kernel/action.yml

@@ -55,7 +55,7 @@ runs:
 
         while [ $attempt -le $MAX_RETRIES ]; do
           echo "Attempt $attempt/$MAX_RETRIES: repo sync (timeout $SYNC_TIMEOUT)..."
-          if timeout $SYNC_TIMEOUT repo sync -c -j16 --fail-fast --no-tags --force-sync --no-clone-bundle --optimized-fetch --retry-fetches=3; then
+          if timeout $SYNC_TIMEOUT repo sync -c -j8 --fail-fast --no-tags --force-sync --no-clone-bundle --optimized-fetch --retry-fetches=3; then
             echo "repo sync succeeded on attempt $attempt."
             break
           fi