Bump awspec from 1.27.1 to 1.28.1

Bumps [awspec](https://github.com/k1LoW/awspec) from 1.27.1 to 1.28.1.
- [Release notes](https://github.com/k1LoW/awspec/releases)
- [Commits](k1LoW/awspec@v1.27.1...v1.28.1)

---
updated-dependencies:
- dependency-name: awspec
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]