tests: subsys: suit: unit: suit_decrypt_filter: fix tags format

yaml list.

Signed-off-by: Piotr Kosycarz <[email protected]>

Author: nordic-piks

tests/subsys/suit/unit/suit_decrypt_filter/testcase.yaml

@@ -1,7 +1,7 @@
 tests:
   suit.unit.suit_decrypt_filter:
     type: unit
-    tags: >-
-      suit
-      suit_decrypt_filter
-      ci_tests_subsys_suit
+    tags:
+      - suit
+      - suit_decrypt_filter
+      - ci_tests_subsys_suit