Bump dataframe-image from 0.2.4 to 0.2.6

Bumps [dataframe-image](https://github.com/dexplo/dataframe_image) from 0.2.4 to 0.2.6.
- [Release notes](https://github.com/dexplo/dataframe_image/releases)
- [Commits](dexplo/dataframe_image@v0.2.4...v0.2.6)

---
updated-dependencies:
- dependency-name: dataframe-image
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>