Bump sphinxcontrib-bibtex from 2.6.5 to 2.7.0 (#251)

Bumps [sphinxcontrib-bibtex](https://github.com/mcmtroffaes/sphinxcontrib-bibtex) from 2.6.5 to 2.7.0.
- [Changelog](https://github.com/mcmtroffaes/sphinxcontrib-bibtex/blob/develop/CHANGELOG.rst)
- [Commits](mcmtroffaes/sphinxcontrib-bibtex@2.6.5...2.7.0)

---
updated-dependencies:
- dependency-name: sphinxcontrib-bibtex
  dependency-version: 2.7.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]