Make sure Scala 3 dialect is used when printing instrumented code

[tgodzik]

Previously, we would use the default dialect, which would print import something._ instead of import something.* and this would break with the -source future flag that drops the former syntax.

Fixes #513

[olafurpg]

The fact that the dialect influences the rendered code indicates that we're using .syntax somewhere instead of .pos.text 🤔 Ideally, the dialect shouldn't any impact on the formatted code because otherwise you risk loosing trivia such as custom formatting and comments

[tgodzik]

The fact that the dialect influences the rendered code indicates that we're using .syntax somewhere instead of .pos.text Ideally, the dialect shouldn't any impact on the formatted code because otherwise you risk loosing trivia such as custom formatting and comments

That was my bad! I was testing it with pos.text, but it seemed not to work, but I forgot to change the test to use * 🤦