Bump src/main/resources/csl-styles from 6167631 to 28ee0a5 (#12981)

Bumps [src/main/resources/csl-styles](https://github.com/citation-style-language/styles) from `6167631` to `28ee0a5`.
- [Release notes](https://github.com/citation-style-language/styles/releases)
- [Commits](citation-style-language/styles@6167631...28ee0a5)

---
updated-dependencies:
- dependency-name: src/main/resources/csl-styles
  dependency-version: 28ee0a509ba772e44d3afbfe7811b7c1bad5ba14
  dependency-type: direct:production
...

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

Author: dependabot[bot]