apps/tests.yaml: Fix parsing failure due to missing LF at EOF.

Commit c930bfe (ASTERISK_30422)
introduced a regression that broke the test suite by removing
the new line at the end of tests/apps/tests.yaml.

This restores that newline so that builds succeed again.

ASTERISK-30452 #close

Change-Id: I4a1dbf85450de84df88cd060b7c7052964458e56

Author: InterLinked1

tests/apps/tests.yaml

@@ -30,4 +30,4 @@ tests:
     - test: 'read'
     - test: 'if'
     - test: 'signal'
-    - test: 'senddtmf'
+    - test: 'senddtmf'