feat: updating flashlight and running go mod tidy

[ ] New code should not be using FutureBuilder (use ValueListenableBuilder instead)
[ ] All strings are defined using localized message keys like 'my_message_key'.i18n and are defined in en.po.
[ ] All colors are defined using Hex (not using built-in colors), are defined in colors.dart and are not duplicated
[ ] All text styles are defined in text_styles.dart and are not duplicated
[ ] All icons are using the vector resource from Figma (do not use built-in Icons)
[ ] Repeated code has been factored into custom widgets
[ ] Layout looks good in both LTR (English) and RTL (Persian) languages
[ ] If you refactored existing code, have you tested the refactored functionality against the old version to make sure you didn't break anything?
[ ] Do the tests pass? Consistently?
[ ] Did this change improve test coverage?
[ ] Is the code in question being linted? If not, consider adding a linter step to CI. If yes, make sure the linter is happy.
[ ] Have you logged tickets for related technical debt with the label “techdebt”?

getlantern / lantern-client