MailsMockTrait remove backward compatibility

[DenTray]

Description

What needs to be done?

Review the assertFixture method in the MailsMockTrait class. Refactor its code to remove all backward compatibility logic related to deprecated Laravel versions that are no longer supported by the package. Ensure the method only supports the current Laravel versions that the package officially supports. Clean up redundant conditionals, branches, and legacy code to simplify and improve maintainability.

Expected Outcome

What is the expected result?

• The assertFixture method no longer contains any code catering to outdated Laravel versions.

• The method works correctly and consistently with supported Laravel versions.

• The code is cleaner, more maintainable, and free from unnecessary backward compatibility checks.

• No breaking changes for the currently supported Laravel versions.

[pirs1337]

merged

[DenTray]

@pirs1337 thanks! Released in https://github.com/RonasIT/laravel-helpers/releases/tag/3.5.4