Bump tslib from 2.7.0 to 2.8.0 (#311)

Bumps [tslib](https://github.com/Microsoft/tslib) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/Microsoft/tslib/releases)
- [Commits](microsoft/tslib@v2.7.0...v2.8.0)

---
updated-dependencies:
- dependency-name: tslib
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>