Update vue-sweetalert2 requirement from 1.5.7 to 1.5.9 (#3229)
Update vue-sweetalert2 requirement from 1.5.7 to 1.5.9 (#3229)

Updates the requirements on [vue-sweetalert2](https://github.com/avil13/vue-sweetalert2) to permit the latest version.
- [Release notes](https://github.com/avil13/vue-sweetalert2/releases)
- [Commits](https://github.com/avil13/vue-sweetalert2/commits)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
syuilo/Misskey,syuilo/Misskey