Update Drupal Symfony Mailer module from ~1 to ~2

Problem/Motivation

Drupal Symfony Mailer 2.0.0-alpha4 was released 18 Jun 2025 by: adamps
https://www.drupal.org/project/symfony_mailer/releases/2.0.0-alpha4

Proposed resolution

• Change drupal/symfony_mailer to ~1 || ~2 in the composer.json file, to allow for a smoother upgrade process

Remaining tasks

• ✅ File an issue about this project
• ✅ Addition/Change/Update/Fix to this project
• ✅ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ➖ Developer Documentation support on feature change/addition
• ➖ User Guide Documentation support on feature change/addition
• ➖ UX/UI designer responsibilities
• ➖ Accessibility and Readability
• ✅ Code review from 1 Varbase core team member
• ✅ Full testing and approval
• ✅ Credit contributors
• ✅ Review with the product owner
• ✅ Update Release Notes and Update Helper on new feature change/addition
• ✅ Release varbase-9.1.10, varbase_email-9.1.7, varbase-10.0.6, varbase_email-10.0.9, varbase-10.1.0-alpha2, varbase_email-10.1.0-alpha3

Varbase update type

• ✅ No Update
• ➖ Optional Update
• ➖ Forced Update
• ➖ Forced Update if Unchanged

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• Issue #3532463: Updated Drupal Symfony Mailer module from ~1 to ~2