fix: downgrade jakarta.mail to 1.6.7

JakartaMail 2.x switched to the new `jakarta.mail` namespace.
So libraries using earlier versions of JakartaMail/JavaMail will not work with it as they need the `javax.mail` namespace.

Spring 5.x is importing stuff from `javax.mail` namespace and so cannot be used with JakartaMail 2.x for now.

According to Support for Jakarta EE 9 (annotations and interfaces in jakarta.* namespace), Spring will switch to using the jakarta.* namespace in Spring Framework 6 / Spring Boot 3. For details see: spring-projects/spring-framework#25354

pom.xml

@@ -102,7 +102,7 @@
         <jakarta.validation-api.version>2.0.2</jakarta.validation-api.version>
         <jakarta.annotation-api.version>1.3.5</jakarta.annotation-api.version>
         <javax.inject.version>1</javax.inject.version>
-        <jakarta.mail.version>2.0.1</jakarta.mail.version>
+        <jakarta.mail.version>1.6.7</jakarta.mail.version>
         <javax.servlet-api.version>4.0.1</javax.servlet-api.version>
         <jakarta.transaction-api.version>1.3.3</jakarta.transaction-api.version>
         <jakarta.activation-api.version>1.2.2</jakarta.activation-api.version>