build(deps): bump @contentful/content-source-maps (#2542)

Bumps the production-dependencies group with 1 update: [@contentful/content-source-maps](https://github.com/contentful/live-preview).


Updates `@contentful/content-source-maps` from 0.11.26 to 0.11.28
- [Release notes](https://github.com/contentful/live-preview/releases)
- [Commits](https://github.com/contentful/live-preview/compare/@contentful/[email protected]...@contentful/[email protected])

---
updated-dependencies:
- dependency-name: "@contentful/content-source-maps"
  dependency-version: 0.11.28
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: production-dependencies
...

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

Author: dependabot[bot]