tests: Extend test-spec with new entry for CI-boot-test

Trigger downstream bootloader tests when changes done
in subsys/nrf_security

Signed-off-by: Grzegorz Chwierut <[email protected]>

Author: gchwier

.github/test-spec.yml

@@ -176,6 +176,7 @@
   - "subsys/fw_info/**/*"
   - "subsys/mgmt/**/*"
   - "subsys/pcd/**/*"
+  - "subsys/nrf_security/**/*"
   - "subsys/nrf_compress/**/*"
   - "tests/subsys/bootloader/**/*"
   - "tests/subsys/dfu/**/*"