Fix deprecated on php 8.1 (#44)

Author: neodc

src/CMText/Message.php

@@ -266,6 +266,7 @@ public function WithPayment(PaymentMessage $paymentMessage)
     /**
      * @return object
      */
+	#[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         $return = [

src/CMText/MessageBody.php

@@ -87,6 +87,7 @@ public function WithType(string $type): MessageBody
     /**
      * @return object
      */
+	#[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return (object)[

src/CMText/RichContent/Common/Contact.php

@@ -169,6 +169,7 @@ public function addUrl(ContactUrl $ContactUrl)
     /**
      * @inheritDoc
      */
+	#[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         // none of the properties are required, so we filter the empty ones.

src/CMText/RichContent/Common/ContactAddress.php

@@ -95,6 +95,7 @@ public function __construct(
     /**
      * @inheritDoc
      */
+	#[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         // none of these properties are required, so we filter the empty ones.

src/CMText/RichContent/Common/ContactBirthday.php

@@ -25,6 +25,7 @@ public function __construct(\DateTimeInterface $Birthday)
     /**
      * @inheritDoc
      */
+	#[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return $this->date->format('Y-m-d');

src/CMText/RichContent/Common/ContactEmail.php

@@ -50,6 +50,7 @@ public function __construct(string $Email = '', string $Type = '')
     /**
      * @inheritDoc
      */
+	#[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         // none of these properties are required, so we filter the empty ones.

src/CMText/RichContent/Common/ContactName.php

@@ -67,6 +67,7 @@ public function __construct(
     /**
      * @inheritDoc
      */
+	#[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         $required = [

src/CMText/RichContent/Common/ContactOrganization.php

@@ -43,6 +43,7 @@ public function __construct(
     /**
      * @inheritDoc
      */
+	#[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         // none of the properties are required, so we filter the empty ones.

src/CMText/RichContent/Common/ContactPhonenumber.php

@@ -49,6 +49,7 @@ public function __construct(string $Phone = '', string $PhonenumberType = '')
     /**
      * @inheritDoc
      */
+	#[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         // none of the properties are required, so we filter the empty ones.

src/CMText/RichContent/Common/ContactUrl.php

@@ -39,6 +39,7 @@ public function __construct(string $Url, string $ContactUrlType = '')
     /**
      * @inheritDoc
      */
+	#[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         // none of the properties are required, so we filter the empty ones.