scripts: Quarantine iso_time_sync on nrf54l15pdk

GPIOTE cannot be used with LED0 on nrf54l15pdk/nrf54l15/cpuapp in
version 0.3.0.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>

Author: rlubos

scripts/quarantine.yaml

@@ -22,3 +22,9 @@
   platforms:
     - nrf54h20dk/nrf54h20/cpuapp
   comment: "Till nRF54H memory layout is revised"
+
+- scenarios:
+    - sample.bluetooth.iso_time_sync
+  platforms:
+    - nrf54l15pdk/nrf54l15/cpuapp
+  comment: "https://nordicsemi.atlassian.net/browse/DRGN-22129"