chore(deps-dev): bump microbundle from 0.12.0 to 0.12.3 (#10)

Bumps [microbundle](https://github.com/developit/microbundle) from 0.12.0 to 0.12.3.
- [Release notes](https://github.com/developit/microbundle/releases)
- [Commits](developit/microbundle@0.12.0...0.12.3)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>