Fix cannot delete measure linked to risk

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/coredata/migrations/20250505T180700Z.sql

@@ -0,0 +1,6 @@
+ALTER TABLE risks_measures DROP CONSTRAINT risks_mitigations_mitigation_id_fkey;
+
+ALTER TABLE risks_measures
+  ADD CONSTRAINT risks_mitigations_mitigation_id_fkey
+  FOREIGN KEY (measure_id) REFERENCES measures(id)
+  ON DELETE CASCADE;