fix(deps): bump @vue/composition-api from 0.6.2 to 0.6.3

Bumps [@vue/composition-api](/~https://github.com/vuejs/composition-api) from 0.6.2 to 0.6.3.
- [Release notes](/~https://github.com/vuejs/composition-api/releases)
- [Changelog](/~https://github.com/vuejs/composition-api/blob/master/CHANGELOG.md)
- [Commits](vuejs/composition-api@v0.6.2...v0.6.3)

Signed-off-by: dependabot[bot] <support@github.com>