scripts: quarantine: add nrf.extended.sample.basic.blinky

Regression.

Signed-off-by: Piotr Kosycarz <piotr.kosycarz@nordicsemi.no>

Author: nordic-piks

scripts/quarantine.yaml

@@ -97,3 +97,9 @@
   platforms:
     - nrf52840dk/nrf52840
   comment: "https://nordicsemi.atlassian.net/browse/NCSDK-39216"
+
+- scenarios:
+    - nrf.extended.sample.basic.blinky
+  platforms:
+    - nrf54lm20dongle/nrf54lm20b/cpuapp
+  comment: "https://nordicsemi.atlassian.net/browse/NCSDK-39226"