build(deps): bump datafusion-substrait from 50.2.0 to 50.3.0

Bumps [datafusion-substrait](https://github.com/apache/datafusion) from 50.2.0 to 50.3.0.
- [Changelog](https://github.com/apache/datafusion/blob/main/CHANGELOG.md)
- [Commits](apache/datafusion@50.2.0...50.3.0)

---
updated-dependencies:
- dependency-name: datafusion-substrait
  dependency-version: 50.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]