Bump the all-deps group with 3 updates (#80)

Bumps the all-deps group with 3 updates: [matplotlib](https://github.com/matplotlib/matplotlib), [xtgeo](https://github.com/equinor/xtgeo) and [ruff](https://github.com/astral-sh/ruff).


Updates `matplotlib` from 3.10.8 to 3.10.9
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.10.8...v3.10.9)

Updates `xtgeo` from 4.20.0 to 4.21.0
- [Release notes](https://github.com/equinor/xtgeo/releases)
- [Changelog](https://github.com/equinor/xtgeo/blob/main/docs/release_notes.md)
- [Commits](equinor/xtgeo@4.20.0...4.21.0)

Updates `ruff` from 0.15.11 to 0.15.12
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.15.11...0.15.12)

---
updated-dependencies:
- dependency-name: matplotlib
  dependency-version: 3.10.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: all-deps
- dependency-name: xtgeo
  dependency-version: 4.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: all-deps
- dependency-name: ruff
  dependency-version: 0.15.12
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: all-deps
...

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Author: dependabot[bot]