Bump domdf-python-tools from 3.6.1 to 3.7.0 (#137)

Bumps [domdf-python-tools](https://github.com/domdfcoding/domdf_python_tools) from 3.6.1 to 3.7.0.
- [Release notes](https://github.com/domdfcoding/domdf_python_tools/releases)
- [Commits](domdfcoding/domdf_python_tools@v3.6.1...v3.7.0)

---
updated-dependencies:
- dependency-name: domdf-python-tools
  dependency-type: indirect
  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>