chore: fix broken symlinks in license files (#6336)

symlink to repo root

core/tests/restart/LICENSE.spdx

@@ -1 +1 @@
-../../../../LICENSE.spdx
+../../../LICENSE.spdx

core/tests/restart/LICENSE_APACHE-2.0

@@ -1 +1 @@
-../../../../LICENSE_APACHE-2.0
+../../../LICENSE_APACHE-2.0

core/tests/restart/LICENSE_MIT

@@ -1 +1 @@
-../../../../LICENSE_MIT
+../../../LICENSE_MIT