Bump python-frontmatter from 1.0.1 to 1.1.0 (#541)

Bumps [python-frontmatter](https://github.com/eyeseast/python-frontmatter) from 1.0.1 to 1.1.0.
- [Release notes](https://github.com/eyeseast/python-frontmatter/releases)
- [Commits](eyeseast/python-frontmatter@v1.0.1...v1.1.0)

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

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

requirements.txt

@@ -115,7 +115,7 @@ python-dateutil==2.8.2
     # via
     #   ghp-import
     #   render-engine (pyproject.toml)
-python-frontmatter==1.0.1
+python-frontmatter==1.1.0
     # via render-engine (pyproject.toml)
 python-slugify==8.0.1
     # via render-engine (pyproject.toml)