[5.8] Uses composer default version constraint ^ (caret)

[nunomaduro]

Uses composer default version constraint ^ (caret) in the new package egulias/email-validator.

[driesvints]

Can you also update the dependency in the composer.json for the validation component?

[phroggyy]

@nunomaduro ^ should be fine, but note that ~ was chosen as that is what Swiftmailer relies on, and I wanted to keep those matched. That said, ~2.0 and ^2.0 should be the same anyway