[CI] clang-tidy auto fixes

tests/integration/data/BackendFactoryTests.cpp

@@ -85,7 +85,7 @@ protected:
 
 class BackendCassandraFactoryTestWithDB : public BackendCassandraFactoryTest {
 protected:
-    ~BackendCassandraFactoryTestWithDB()
+    () override
     {
         // drop the keyspace for next test
         data::cassandra::Handle const handle{TestGlobals::instance().backendHost};

tests/integration/data/cassandra/BackendTests.cpp

@@ -115,7 +115,7 @@ protected:
 
     std::default_random_engine randomEngine_{0};
 
-    ~BackendCassandraTest()
+    () override
     {
         // drop the keyspace for next test
         Handle const handle{TestGlobals::instance().backendHost};

tests/integration/migration/cassandra/CassandraMigrationManagerTests.cpp

@@ -155,7 +155,7 @@ protected:
         setupDatabase();
     }
 
-    ~MigrationCassandraSimpleTest()
+    () override
     {
         // drop the keyspace
         Handle const handle{TestGlobals::instance().backendHost};