Build: Bump pyiceberg-core from 0.5.1 to 0.6.0

Bumps [pyiceberg-core](https://rust.iceberg.apache.org) from 0.5.1 to 0.6.0.

---
updated-dependencies:
- dependency-name: pyiceberg-core
  dependency-version: 0.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]