fix: Make all constructor arguments for transaction events non-nullable

Author: exaby73

src/Event/Transaction/PostTransactionBeginEvent.php

@@ -7,9 +7,9 @@ class PostTransactionBeginEvent
     public const EVENT_ID = 'neo4j.transaction.begin.post';
 
     public function __construct(
-        public readonly ?string $alias,
+        public readonly string $alias,
         public readonly \DateTimeInterface $time,
-        public readonly ?string $scheme,
+        public readonly string $scheme,
         public readonly string $transactionId,
     ) {
     }

src/Event/Transaction/PostTransactionCommitEvent.php

@@ -7,9 +7,9 @@ class PostTransactionCommitEvent
     public const EVENT_ID = 'neo4j.transaction.commit.post';
 
     public function __construct(
-        public readonly ?string $alias,
+        public readonly string $alias,
         public readonly \DateTimeInterface $time,
-        public readonly ?string $scheme,
+        public readonly string $scheme,
         public readonly string $transactionId,
     ) {
     }

src/Event/Transaction/PostTransactionRollbackEvent.php

@@ -7,9 +7,9 @@ class PostTransactionRollbackEvent
     public const EVENT_ID = 'neo4j.transaction.rollback.post';
 
     public function __construct(
-        public readonly ?string $alias,
+        public readonly string $alias,
         public readonly \DateTimeInterface $time,
-        public readonly ?string $scheme,
+        public readonly string $scheme,
         public readonly string $transactionId,
     ) {
     }

src/Event/Transaction/PreTransactionBeginEvent.php

@@ -7,9 +7,9 @@ class PreTransactionBeginEvent
     public const EVENT_ID = 'neo4j.transaction.begin.pre';
 
     public function __construct(
-        public readonly ?string $alias,
+        public readonly string $alias,
         public readonly \DateTimeInterface $time,
-        public readonly ?string $scheme,
+        public readonly string $scheme,
         public readonly string $transactionId,
     ) {
     }

src/Event/Transaction/PreTransactionCommitEvent.php

@@ -7,9 +7,9 @@ class PreTransactionCommitEvent
     public const EVENT_ID = 'neo4j.transaction.commit.pre';
 
     public function __construct(
-        public readonly ?string $alias,
+        public readonly string $alias,
         public readonly \DateTimeInterface $time,
-        public readonly ?string $scheme,
+        public readonly string $scheme,
         public readonly string $transactionId,
     ) {
     }

src/Event/Transaction/PreTransactionRollbackEvent.php

@@ -7,9 +7,9 @@ class PreTransactionRollbackEvent
     public const EVENT_ID = 'neo4j.transaction.rollback.pre';
 
     public function __construct(
-        public readonly ?string $alias,
+        public readonly string $alias,
         public readonly \DateTimeInterface $time,
-        public readonly ?string $scheme,
+        public readonly string $scheme,
         public readonly string $transactionId,
     ) {
     }