Build: Bump pyiceberg-core from 0.6.0 to 0.7.0

Bumps [pyiceberg-core](https://rust.iceberg.apache.org) from 0.6.0 to 0.7.0.

---
updated-dependencies:
- dependency-name: pyiceberg-core
  dependency-version: 0.7.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]