refactor: Convert switch to if statements

Author: exaby73

src/Bolt/BoltUnmanagedTransaction.php

@@ -98,14 +98,16 @@ public function commit(iterable $statements = []): CypherList
     public function rollback(): void
     {
         if ($this->isFinished()) {
-            switch ($this->state) {
-                case TransactionState::TERMINATED:
-                    throw new ClientException("Can't rollback, transaction has been terminated");
-                case TransactionState::COMMITTED:
-                    throw new ClientException("Can't rollback, transaction has already been committed");
-                case TransactionState::ROLLED_BACK:
-                    throw new ClientException("Can't rollback, transaction has already been rolled back");
-                default:
+            if ($this->state === TransactionState::TERMINATED) {
+                throw new ClientException("Can't rollback, transaction has been terminated");
+            }
+
+            if ($this->state === TransactionState::COMMITTED) {
+                throw new ClientException("Can't rollback, transaction has already been committed");
+            }
+
+            if ($this->state === TransactionState::ROLLED_BACK) {
+                throw new ClientException("Can't rollback, transaction has already been rolled back");
             }
         }